Battery module unit bracket, module unit and battery module

Abstract

The invention relates to a battery module unit bracket which comprises a strip-shaped panel, a radiating plate clamping plate, a first elastic clamping hook and a second elastic clamping hook, the radiating plate clamping plate provided with a clamping seam is vertically fixed on the back surface of the strip-shaped panel along the longitudinal direction; the two tab through holes in the strip-shaped panel are formed in two sides of the radiating plate clamping plate in parallel; the front surface of the strip-shaped panel is provided with two first elastic clamping hooks which are oppositely arranged outside the two ends of the tab through hole, the strip-shaped panel is provided with second elastic clamping hooks, and the opposite side surfaces of the second elastic clamping hooks are provided with clamping holes which can be matched with the second elastic clamping hooks. The invention also provides a battery module unit and a battery module which are assembled by the battery module unit bracket. When the battery module units assembled by the battery module unit bracket are assembled into groups, the metal connecting plates are clamped and fixed by the two opposite first elastic clamping hooks, and a plurality of same-polarity tabs folded on the same metal connecting plate are welded at one time through laser welding, so that the grouping is convenient and efficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft-pack lithium-ion batteries, and particularly relates to a battery module unit bracket, a module unit and a module. Background Art

[0002] Lithium-ion batteries are very popular due to many advantages such as high specific energy and long cycle life. In particular, soft-pack lithium-ion battery modules are widely used in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools. However, these devices have an increasing demand for the energy density of the lithium-ion battery system. In traditional soft-pack lithium-ion battery modules, the tabs of multiple soft-pack battery cells are on the same end face. During the charge and discharge process of the battery, the current mainly flows between the positive electrode plate and the negative electrode plate near the tabs, and there is less current distribution on the electrode plates far from the tabs. This non-uniform current distribution in the battery cell, on the one hand, causes the active substances on the electrode plates far from the tabs to not be fully utilized, resulting in the electrical performance of the active substances not being fully exerted and the energy density not reaching the optimum; on the other hand, it causes the active substances on the electrode plates near the tabs to age prematurely, deteriorate the performance, and lead to the premature end of the life of the entire battery cell and failure.

[0003] To solve this technical problem, the prior art uses soft-pack battery cells with tabs at both ends, and the positive tab and the negative tab are respectively led out at both ends of the soft-pack battery cell. However, when such soft-pack battery cells with tabs at both ends are assembled into a battery module, the processes are numerous and the grouping efficiency is low. For example, the patent document CN217881610U discloses a new soft-pack module structure with tabs on both sides. There are two battery cells and a module frame in each battery module, and a tab extends from each of the upper and lower ends of each battery cell. During grouping, an insert aluminum row is provided at each of the upper and lower ends of each module frame, and the two tabs are welded and fixed to the adjacent insert aluminum rows by laser welding to form a two-parallel module. Then, multiple two-parallel modules are connected in series through a series aluminum row, and the module frames are mutually clamped and then welded and fixed by side pressure bars to form a group. In the grouping process of this technical solution, each battery cell has to be welded twice for the tabs respectively, and the number of tab welds in a battery module is particularly large, the processes are quite cumbersome, and the grouping efficiency is low. Summary of the Invention

[0004] The object of the present invention is to provide a battery module unit bracket for the grouping of soft-pack battery modules with tabs at both ends, which is convenient for grouping, has few welding operations, and high grouping efficiency.

[0005] The technical solution of the present invention is as follows:

[0006] A battery module unit bracket includes a strip panel, a heat dissipation board clamping plate, a first elastic hook and a second elastic hook; the heat dissipation board clamping plate is vertically fixed to the back of the strip panel along the longitudinal direction, a clamping seam is arranged on the heat dissipation board clamping plate, and the clamping seam is arranged along the longitudinal central plane of the back of the strip panel; two long strip-shaped tab perforations are longitudinally arranged on the strip panel, and the two tab perforations are respectively arranged in parallel on both sides of the heat dissipation board clamping plate; two opposite first elastic hooks are arranged on the front of the strip panel, and the two first elastic hooks are respectively arranged outside the two ends of the tab perforation; second elastic hooks are respectively arranged on two longer side surfaces of the strip panel, and a clamping hole that can be matched with it is arranged on the opposite side surface of each second elastic hook.

[0007] Preferably, the two second elastic hooks are symmetrically arranged about the center on the strip panel.

[0008] Preferably, guide plates are respectively fixed outside the two tab perforations, and the guide plates are parallel to the heat dissipation board clamping plate.

[0009] Preferably, two pairs of support columns are arranged on the front of the strip panel, each pair of support columns includes a first support column and a second support column, and the paired first support column and the second support column are symmetrically arranged with respect to the longitudinal central plane; the two first support columns in the two pairs of support columns are symmetrically arranged about the center on the strip panel, and the two second support columns in the two pairs of support columns are symmetrically arranged about the center on the strip panel; a pin column is arranged on the outer surface of the first support column, and a pin hole that can be matched with the pin column is arranged on the outer surface of the second support column; the heights of the first support column and the second support column are greater than the height of the first elastic hook; the first support column and the second support column are closer to the end of the strip panel than the first elastic hook.

[0010] The present invention also provides a battery module unit, including the above battery module unit bracket, a soft-pack battery cell and a metal heat dissipation board; there are two battery module unit brackets, and two ends of the metal heat dissipation board are respectively clamped in the clamping seams of the two relatively arranged battery module unit brackets; there are two soft-pack battery cells, which are respectively arranged on both sides of the metal heat dissipation board; the positive and negative tabs of the soft-pack battery cells respectively extend from both ends, the same-sex tabs of the two soft-pack battery cells are located at the same end of the metal heat dissipation board, and the tabs of the soft-pack battery cells respectively pass through the tab perforations.

[0011] Preferably, right-angle flanges are arranged on both sides of the metal heat dissipation board. The metal heat dissipation board can be an aluminum plate, an iron plate or a copper plate.

[0012] Preferably, an auxiliary clamping plate is fixed to the back surface of the strip-shaped panel, and a clamping protrusion is provided on the auxiliary clamping plate; a clamping hole is provided on the metal heat dissipation plate, and the clamping protrusion and the clamping hole are clamped in an interference fit.

[0013] The present invention also provides a battery module, including a metal connection plate and a plurality of the above-mentioned battery module units that are clamped to each other; two adjacent battery module units are clamped and fixed to each other through a battery module unit bracket. The specific clamping method is as follows: the second elastic hook of one battery module unit bracket is clamped to the clamping hole at the corresponding position of another adjacent battery module unit bracket; the metal connection plate is elastically clamped between the opposite first elastic hooks. A plurality of long and flat holes are provided on the metal connection plate, and the positions of the long and flat holes correspond to the positions of the tab ears; the tab ears of a plurality of the battery module units pass through the long and flat holes in sequence and then are folded, and a plurality of folded tab ears of the same polarity are welded to one of the metal connection plates.

[0014] Preferably, a communication connection hole is provided on the metal connection plate for connecting a communication line.

[0015] Preferably, there are a plurality of metal connection plates, and the metal connection plates are insulated from each other.

[0016] The beneficial effects of the present invention are as follows:

[0017] The battery module unit bracket of the present invention realizes the mutual clamping of two battery module unit brackets by providing a second elastic hook and a clamping hole; and realizes the clamping and fixing of the metal connection plate by providing two opposite first elastic hooks. The battery module unit of the present invention fixes the battery module unit brackets at both ends of the metal heat dissipation plate, respectively passes the positive tab ears and negative tab ears of two soft-pack battery cells through the tab ear perforations and then folds them on the metal connection plate, and a plurality of tab ears of the same polarity folded on the same metal connection plate are welded at one time by laser welding, with high welding efficiency, convenient and efficient grouping. Description of the Drawings

[0018] Figure 1 is a perspective view of the soft-pack battery module unit bracket of the present invention.

[0019] Figure 2 is a front view of the soft-pack battery module unit bracket of the present invention.

[0020] Figure 3 is Figure 2 the right view of

[0021] Figure 4 is Figure 2 the left view of

[0022] Figure 5 is Figure 2 the bottom view of

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the metal heat dissipation plate.

[0024] Figure 7 Schematic diagram of the assembly of the battery module unit of the present invention.

[0025] Figure 8 Three-dimensional structure diagram of the battery module unit of the present invention.

[0026] Figure 9 Schematic diagram of the assembly of the battery module of the present invention.

[0027] Figure 10 It is Figure 9 Enlarged view of part A of

[0028] Figure 11 The battery module of the present invention.

[0029] In the figure:

[0030] 1. Battery module unit bracket; 11. Strip panel; 111. Tab perforation; 12. Heat dissipation plate clamping plate; 121. Clamping seam; 13. First elastic hook; 14. Second elastic hook; 141. Clamping hole; 15. First support column; 151. Pin column; 16. Second support column; 161. Pin hole; 17. Auxiliary clamping plate; 171. Clamping convex; 18. Guide plate; 2. Soft-pack battery cell; 21. Positive tab; 22. Negative tab; 23. Turned-over tab; 3. Metal heat dissipation plate; 31. Right-angle flanging; 32. Clamping hole; 4. First metal connecting plate; 41. Long and narrow hole; 42. Communication connection hole. 5. Second metal connecting plate; 6. First battery module unit; 7. Second battery module unit; 8. Third metal connecting plate. Detailed implementation mode

[0031] The present invention will be described in detail below with reference to the embodiments.

[0032] Embodiment 1

[0033] This embodiment provides a battery module unit bracket, Figure 1 Three-dimensional view of the soft-pack battery module unit bracket of the present invention. Figure 2 Front view of the soft-pack battery module unit bracket of the present invention. Figure 3 It is Figure 2 Right view of Figure 4 It is Figure 2 Left view of Figure 5 It is Figure 2 Bottom view of Figure 1 、 2As shown in Figures 3, 4, and 5, the battery module unit bracket of the present invention includes a strip panel 11, a heat dissipation board clamping plate 12, a first elastic hook 13, and a second elastic hook 14; the heat dissipation board clamping plate 12 is vertically fixed to the back of the strip panel 11 along the longitudinal direction, a clamping seam 121 is provided on the heat dissipation board clamping plate 12, and the clamping seam 121 is arranged along the longitudinal central axis plane of the back of the strip panel 11; two long strip-shaped tab perforations 111 are longitudinally provided on the strip panel 11, and the two tab perforations 111 are respectively arranged in parallel on both sides of the heat dissipation board clamping plate 12; two opposite first elastic hooks 13 are provided on the front of the strip panel 11, and the two first elastic hooks 13 are respectively arranged outside the two ends of the tab perforation 111; second elastic hooks 14 are respectively provided on the two longer side surfaces of the strip panel 11, and a clamping hole 141 that can be matched with it is provided on the opposite side surface of each second elastic hook 14.

[0034] Preferably, the two second elastic hooks 14 are symmetrically arranged about the center on the strip panel 11, and the two clamping holes 141 are symmetrically arranged about the center on the strip panel 11. After the second elastic hooks 14 and the clamping holes 141 are symmetrically arranged about the center, the structure of the battery module unit bracket is symmetric during clamping installation, and misinstallation will not occur, which is more convenient.

[0035] Preferably, guide plates 18 are respectively fixed outside the two tab perforations 111, and the guide plates 18 are parallel to the heat dissipation board clamping plate 12.

[0036] Preferably, two pairs of support columns are provided on the front of the strip panel 111, each pair of support columns includes a first support column 15 and a second support column 16, and the paired first support column 15 and the second support column 16 are symmetrically arranged with respect to the longitudinal central axis plane; the two first support columns 15 in the two pairs of support columns are symmetrically arranged about the center on the strip panel 11, and the two second support columns 16 in the two pairs of support columns are symmetrically arranged about the center on the strip panel 11; a pin column 151 is provided on the outer surface of the first support column 15, and a pin hole 161 that can be matched with the pin column 151 is provided on the outer surface of the second support column 16; the heights of the first support column 15 and the second support column 16 are greater than the height of the first elastic hook 13; the first support column 15 and the second support column 16 are closer to the end of the strip panel 11 than the first elastic hook 13. The first support column 15 and the second support column 16 can be semi-cylindrical or semi-truncated cone-shaped columns.

[0037] Embodiment 2

[0038] This embodiment provides a battery module unit. Figure 7 It is an assembly schematic diagram of the battery module unit of the present invention.Figure 8 This is a three-dimensional structure diagram of the battery module unit of the present invention. As Figure 7 , 8 shown, the battery module unit includes a battery module unit bracket 1, a soft-pack battery cell 2, and a metal heat dissipation plate 3; Figure 6 This is a schematic structural diagram of the metal heat dissipation plate. There are two battery module unit brackets 1 in the battery module unit. Both ends of the metal heat dissipation plate 3 are respectively clamped in the clamping seams 121 of the two relatively arranged battery module unit brackets 1. There are two soft-pack battery cells 2, which are respectively arranged on both sides of the metal heat dissipation plate 3; the positive electrode tabs 21 and negative electrode tabs 22 of the soft-pack battery cells 2 respectively extend from both ends of the soft-pack battery cells 2, and the same-sex electrode tabs of the two soft-pack battery cells 2 are located at the same end of the metal heat dissipation plate 3, and the electrode tabs of the soft-pack battery cells 2 respectively pass through the electrode tab perforations 111.

[0039] Preferably, right-angled flanges 31 are provided on both sides of the metal heat dissipation plate 3. The metal heat dissipation plate 3 can be an aluminum plate, an iron plate, or a copper plate.

[0040] Preferably, an auxiliary clamping plate 17 is fixed to the back of the strip-shaped panel 11, and a clamping protrusion 171 is provided on the auxiliary clamping plate 17; a clamping hole 32 is provided on the metal heat dissipation plate 3, and the clamping protrusion 171 and the clamping hole 32 are clamped in an interference fit. For the battery module unit bracket provided with the auxiliary clamping plate, when assembling into a battery module unit, in addition to being clamped with the clamping seam 121, the metal heat dissipation plate 3 is also fixed by the clamping of the clamping hole 32 and the clamping protrusion 171, which is more firm, and when used in large electrical equipment such as automobiles, loosening or noise caused by vibration can be avoided.

[0041] Preferably, guide plates 18 are respectively fixed to the outsides of the two electrode tab perforations 111 of the battery module unit bracket, and the guide plates 18 are parallel to the heat dissipation plate clamping plate 12. For the battery module unit bracket provided with the guide plates 18, when the electrode tabs pass through the electrode tab perforations 111, the guide plates 18 play a guiding role for the electrode tabs, facilitating the alignment of the electrode tabs with the electrode tab perforations. Of course, the inner sides of the guide plates 18 can be set to an inclined shape facing the electrode tab perforations 111 as Figure 5 shown, so that it is more convenient to pass the electrode tabs. In addition, the guide plates 18 are arranged on the outsides of the electrode tab perforations 111, which play a role in restricting the positions of the electrode tabs, preventing the electrode tabs from protruding outside the battery module unit bracket in the case of deformation and causing accidental short circuits.

[0042] Embodiment 3

[0043] This embodiment provides a battery module. Figure 9 This is an assembly schematic diagram of the battery module of the present invention, Figure 10 For Figure 9 the enlarged view of A in Figure 11Another assembled battery module. As Figure 9 , 10 , as shown in 11, the battery module of this embodiment includes a first metal connecting plate 4, a second metal connecting plate 5, and a plurality of mutually snap-connected battery module units such as a first battery module unit 6 and a second battery module unit 7 that are snap-connected to each other. Adjacent two battery module units are snap-connected and fixed through a battery module unit bracket. The specific snap-connection method is as follows: When the adjacent first battery module unit 6 and the second battery module unit 7 are snap-connected, the second elastic hooks 14 at both ends of the first battery module unit 6 and the snap holes 141 at the corresponding positions are respectively snap-connected. After all the battery module unit brackets at both ends of each soft-pack battery cell 2 are snap-connected, the metal connecting plates are installed. As Figure 9 shown, a plurality of long and flat holes 41 are provided on the first metal connecting plate 4, and the positions of the long and flat holes 41 correspond to the positions of the pole ears; the positive pole ears 21 of the plurality of battery module units are sequentially passed through the long and flat holes 41, and then the first metal connecting plate 4 is pressed down and snap-connected between the opposite first elastic hooks 13, and then all the positive pole ears 21 are folded, and a plurality of folded like-pole ears are welded to one first metal connecting plate 4. Figure 9 The metal connecting plate three 8 on is the state after the pole ears are folded. Finally, through die pressing and laser welding, the first metal connecting plate 4 and a plurality of folded pole ears are welded and fixed at one time. The second metal connecting plate 5 is installed in the same way, and insulation is provided between the first metal connecting plate 4 and the second metal connecting plate 5. The welding of the pole ears at the other end of the battery module is completed in the same way. In specific use, the first metal connecting plate 4 and the second metal connecting plate 5 can be connected in parallel or in series according to the circuit requirements. Figure 9 Three metal connecting plates are provided to show that there can be multiple metal connecting plates in a battery module. In actual production, the number of battery connecting plates can be determined according to needs. For example, Figure 11 the shown battery module has only two metal connecting plates. Of course, there can also be only one metal connecting plate, depending on the requirements of the specific circuit. Each metal connecting plate only needs one laser welding to complete the welding of multiple pole ears. Therefore, the welding operation is less and the grouping efficiency is high.

[0044] The battery module of this embodiment preferably uses a battery module unit bracket with two pairs of support columns on a strip panel. After such a battery module unit bracket is assembled into a battery module and the battery module is installed in the housing, the two pairs of support columns support the housing, preventing the housing from collapsing due to external force extrusion, thereby avoiding potential safety hazards caused by electrical contact between the housing and the metal connection plate. The first support column and the second support column can be semi-cylindrical or semi-conical columns. In this way, when assembled into a battery module, exactly two second support columns form a cylinder or a frustum of a cone, which is not only beautiful but also has no sharp corners and is safer. In addition, since mating pin columns and pin holes are respectively provided on the first support column and the second support column, when forming a battery module group, the two adjacent battery module units are fixedly positioned through the insertion of the pin columns and the pin holes, so that in addition to the clamping of the second elastic hooks and the clamping holes between the battery module units in the battery module, there is also a more firm and powerful anti-displacement connection, making the battery module more firm.

[0045] Preferably, a communication connection hole 42 is provided on the metal connection plate 4 for connecting communication lines. Communication connection holes can be provided on each metal connection plate as required.

[0046] If right-angle flanges 31 are provided on both sides of the metal heat dissipation plate 3 of each battery module unit, then these right-angle flanges form heat dissipation sides on both sides of the battery module, which is beneficial to the heat dissipation of the soft-pack battery cells during charge and discharge, and the heat dissipation sides can also be in contact with other cooling objects (such as the housing, etc.) to conduct heat outward.

[0047] It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other. In addition, the above is only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. A battery module unit bracket, characterized in that: It comprises a strip panel, a heat sink clip plate, a first elastic hook and a second elastic hook; the heat sink clip plate is vertically fixed to the back of the strip panel in the longitudinal direction, and a clip seam is arranged on the heat sink clip plate, and the clip seam is arranged along the longitudinal central axis surface of the back of the strip panel; two long strip-shaped pole ear perforations are arranged longitudinally on the strip panel, and the two pole ear perforations are respectively arranged in parallel on both sides of the heat sink clip plate; two opposite first elastic hooks are arranged on the front side of the strip panel, and the two first elastic hooks are respectively arranged outside the two ends of the pole ear perforations; the two longer side surfaces of the strip panel are respectively provided with second elastic hooks, and the opposite side surfaces of each second elastic hook are provided with a clip hole that can match it.

2. The battery module unit bracket according to claim 1, characterized in that: The two second elastic hooks are centrally symmetrically arranged on the strip panel.

3. The battery module unit bracket according to claim 1, characterized in that: Guide plates are respectively fixed to the outer sides of the two tab perforations, and the guide plates are parallel to the heat sink clamping plates.

4. The battery module unit bracket according to claim 1, characterized in that: Two pairs of support columns are arranged on the front side of the strip panel, each pair of support columns includes a first support column and a second support column, and the first support column and the second support column in pairs are arranged symmetrically relative to the longitudinal central axis plane; the two first support columns in the two pairs of support columns are arranged centrally symmetrically on the strip panel, and the two second support columns in the two pairs of support columns are arranged centrally symmetrically on the strip panel; a pin column is arranged on the outer surface of the first support column, and a pin hole that can match the pin column is arranged on the outer surface of the second support column; the height of the first support column and the second support column is greater than the height of the first elastic hook; the first support column and the second support column are closer to the end of the strip panel than the first elastic hook.

5. A battery module unit, characterized in that: It comprises the battery module unit bracket, soft-pack battery cell and metal heat sink of one of claims 1 to 4; there are two battery module unit brackets, and the two ends of the metal heat sink are respectively clamped in the clamping seams of two oppositely arranged battery module unit brackets; there are two soft-pack battery cells, which are respectively arranged on both sides of the metal heat sink; the positive and negative pole ears of the soft-pack battery cell extend from the two ends respectively, the same pole ears of the two soft-pack battery cells are located at the same end of the metal heat sink, and the pole ears of the soft-pack battery cell respectively pass through the pole ear perforations.

6. The battery module unit according to claim 5, characterized in that: The two sides of the metal heat dissipation plate are provided with right-angle flanges.

7. The battery module unit according to claim 5, characterized in that: An auxiliary clamping plate is fixed on the back of the strip panel, and a clamping protrusion is arranged on the auxiliary clamping plate; a clamping hole is arranged on the metal heat dissipation plate, and the clamping protrusion and the clamping hole are clamped by interference fit.

8. A battery module, characterized in that: It comprises a metal connecting plate and a plurality of battery module units as claimed in any one of claims 5 to 7 which are clamped to each other; two adjacent battery module units are clamped and fixed to each other via a battery module unit bracket, and the specific clamping method is: the second elastic hook of one battery module unit bracket is matched and clamped with the clamping hole at the corresponding position of another adjacent battery module unit bracket; the metal connecting plate is elastically clamped between the relative first elastic hooks, and a plurality of long and flat holes are arranged on the metal connecting plate, and the positions of the long and flat holes correspond to the positions of the pole ears; the pole ears of the plurality of battery module units are successively passed through the long and flat holes and then folded, and a plurality of folded same-sex pole ears are welded to one of the metal connecting plates.

9. The battery module according to claim 8, characterized in that: The metal connection plate is provided with a communication connection hole for connecting a communication line.

10. The battery module according to claim 8, characterized in that: There are multiple metal connecting plates, and each metal connecting plate is insulated from another.

Images