Thin low-voltage battery module

Abstract

This utility model belongs to the field of electric vehicle power supply and discloses a thin low-voltage battery module that can be installed in the under-seat space, thereby greatly reducing the risk of being squeezed and collided, and is easy to install and maintain. It includes a module base shell with a longitudinal and a height direction. The module base shell forms a cell receiving cavity and a circuit board receiving cavity distributed sequentially along the longitudinal direction of the base shell. The cell receiving cavity is used to accommodate the low-voltage cell pack, and the circuit board receiving cavity is used to accommodate the control circuit board. The orthographic projection of the outline of the circuit board receiving cavity along the longitudinal direction of the base shell is located within the orthographic projection of the outline of the cell receiving cavity along the longitudinal direction of the base shell. Since the height of this utility model is basically equal to the cell receiving cavity plus the corresponding shell wall thickness of the module base shell, and the height of the cell receiving cavity is equivalent to the height of the low-voltage cell pack, the height of this utility model is basically equivalent to the total height formed by the low-voltage cell pack and the shell wall of the module base shell.

Description

Technical Field

[0001] This utility model belongs to the field of electric vehicle power supply, specifically relating to a thin low-voltage battery module. Background Technology

[0002] Currently, due to the layout limitations of adjacent components, the low-voltage battery modules in electric vehicles are at risk of being collided and squeezed by nearby components, which could lead to smoke and fire.

[0003] Therefore, for safety, ease of installation and maintenance considerations, low-voltage battery modules should be placed in other locations within electric vehicles to avoid the aforementioned risks. Utility Model Content

[0004] To address the shortcomings of existing technologies, the inventors discovered that placing the low-voltage battery module within the under-seat space between the vehicle chassis and the seat can significantly reduce the risk of being crushed or impacted. However, the height of existing low-voltage battery modules exceeds the height of the under-seat space, making it impossible to install them there. This invention provides a thin low-voltage battery module, thinner than existing modules, which can be installed within the under-seat space, thereby greatly reducing the risk of being crushed or impacted, and is easy to install and maintain.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A thin low-voltage battery module includes a control circuit board and a low-voltage battery cell pack. It is characterized by comprising: a module base shell having a longitudinal direction and a vertical direction; the module base shell having battery cell receiving cavities and circuit board receiving cavities sequentially distributed along the longitudinal direction of the base shell; the battery cell receiving cavities accommodating the low-voltage battery cell pack; and the circuit board receiving cavities accommodating the control circuit board; wherein the orthographic projection of the outline of the circuit board receiving cavity along the longitudinal direction of the base shell lies within the orthographic projection of the outline of the battery cell receiving cavity along the longitudinal direction of the base shell.

[0006] Preferably, the present invention further includes a side sealing end cap, which covers the cell receiving cavity along the length of the base shell. The two sides of the side sealing end cap have auxiliary bosses and fixing brackets respectively. The auxiliary bosses extend along the length of the base shell and are inserted into the cell receiving cavity. The inner wall of the cell receiving cavity, the outer surface of the low-voltage cell pack and the surface of the auxiliary bosses are filled with potting glue to form a potting glue layer extending along the length of the base shell. The fixing bracket has an integral continuous rib portion and a foot portion, and the foot portion has a fixing through hole.

[0007] Preferably, the module base shell also has a positive electrode channel, a negative electrode channel, and a module mounting through hole. The cell receiving cavity is connected to the circuit board receiving cavity through the positive electrode channel, the negative electrode channel, and the circuit board receiving cavity. The cell receiving cavity is open to the outside at one end of the module base shell along the longitudinal direction. The circuit board receiving cavity is open to the outside on one side of the module base shell along the vertical direction. A positive electrode output terminal and a negative electrode output terminal are formed on the other side of the module base shell along the vertical direction. Both the positive electrode output terminal and the negative electrode output terminal are recessed. The module mounting through hole is a recessed through hole extending along the vertical direction of the base shell. Furthermore, the circuit board housing also includes a positive terminal block, a negative terminal block, a positive output terminal block, and a negative output terminal block. The positive terminal block has a positive terminal and a positive terminal pin, the negative terminal block has a negative terminal and a negative terminal pin, the positive output terminal block has a positive output terminal and a positive output terminal, and the negative output terminal block has a negative output terminal and a negative output terminal.

[0008] Furthermore, this utility model also includes a cell end cap, a positive electrode current guide, and a negative electrode current guide. The cell end cap is located at the end of the cell receiving cavity near the circuit board receiving cavity. The cell end cap is formed by injection molding and has a first through hole and a second through hole corresponding to the positive electrode channel and the negative electrode channel. The positive electrode current guide and the negative electrode current guide each have a continuous integrated current collecting part, a current guiding part, and an output part. The current collecting part and the output part both protrude from the surface of the cell end cap. The current guiding part is embedded inside the cell end cap, and the two current collecting parts are adjacent to the first through hole and the second through hole, respectively. The low-voltage cell includes multiple soft-pack cells connected in series, and the low-voltage cell pack has a positive output tab and a negative output tab. The positive output tab passes through the first through hole and is bent and welded to the adjacent current collecting part; the negative output tab passes through the second through hole and is bent and welded to the adjacent current collecting part.

[0009] Furthermore, the output portion of the corresponding positive output tab passes through the positive channel into the circuit board receiving cavity and is positioned on the positive terminal. Both the positive adapter pin and the positive output pin are electrically connected to the control circuit board. Similarly, the output portion of the corresponding negative output tab passes through the negative channel into the circuit board receiving cavity and is positioned on the negative terminal. Both the negative adapter pin and the negative output pin are electrically connected to the control circuit board. Furthermore, the end cap of the battery cell also has a vent hole, and the circuit board cavity also has a gas discharge hole that is connected to the vent hole. The gas discharge hole is located at the longitudinal end of the module base shell and is open to the outside. When the soft-pack battery cell leaks gas, the gas is discharged to the outside through the vent hole, the circuit board cavity, and the gas discharge hole in sequence.

[0010] Furthermore, this utility model also includes a voltage acquisition board, which is disposed on the end cover of the battery cell. The voltage acquisition board has multiple pairs of voltage acquisition nickel plates and a communication module. The multiple pairs of voltage acquisition nickel plates are used to acquire the voltage of multiple soft-pack battery cells in the low-voltage battery cell pack in real time. The communication module is used to transmit the voltage value corresponding to the acquired output voltage to the control circuit board in the form of a signal.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Because the thin low-voltage battery module of this utility model includes a module base shell, the module base shell has a longitudinal direction and a height direction, and the module base shell forms a cell receiving cavity and a circuit board receiving cavity distributed sequentially along the longitudinal direction of the base shell. The cell receiving cavity is used to receive the low-voltage cell pack, and the circuit board receiving cavity is used to receive the control circuit board. The orthographic projection of the outline of the circuit board receiving cavity along the longitudinal direction of the base shell is located within the orthographic projection of the outline of the cell receiving cavity along the longitudinal direction of the base shell. Since the height of this utility model is basically equal to the cell receiving cavity plus the corresponding shell wall thickness of the module base shell, and the height of the cell receiving cavity is equivalent to the height of the low-voltage cell pack, the height of this utility model is basically equivalent to the total height formed by the low-voltage cell pack and the shell wall of the module base shell. Therefore, this utility model is easy to install in the under-seat space between the vehicle chassis and the bottom of the seat, thereby greatly reducing the risk of being squeezed and collided, and is easy to install and maintain.

[0012] 2. Because the thin low-voltage battery module of this utility model also includes a side sealing end cap, the two sides of the side sealing end cap respectively have an auxiliary boss and a fixing bracket. The auxiliary boss is inserted into the cell receiving cavity. Filling glue is injected between the inner wall of the cell receiving cavity, the outer surface of the low-voltage cell pack, and the surface of the auxiliary boss, thereby forming a filling glue layer extending along the length of the base shell. The fixing bracket has an integral and continuous rib portion and a foot plate portion. The auxiliary boss greatly extends the overlap distance between the side sealing end cap and the cell receiving cavity, so that when the module base shell is impacted, the side sealing end cap can... It can maintain a more stable connection with the module base shell and is not easy to detach. The fixing bracket, through the rib plate and foot plate, can more smoothly transmit the impact force on the auxiliary boss to the external fixing reference surface. Since most of the module's mass is concentrated in the solid part corresponding to the cell housing cavity, the auxiliary boss and fixing bracket can make the module base shell as a whole stable. Therefore, the side sealing end cap of this utility model has a high bonding strength with the module base shell and also enhances the overall stability of the thin low-voltage battery module with uneven mass. 3. Because the cell housing cavity of this utility model opens to the outside at one end of the module base shell along the longitudinal direction, and the circuit board housing cavity opens to the outside on one side of the module base shell along the vertical direction, and the module base shell forms a positive output terminal and a negative output terminal on the other side of the vertical direction, and both the positive output terminal and the negative output terminal are recessed, and the module mounting through hole is a recessed through hole extending along the vertical direction of the base shell, that is, the wiring structure of this utility model and the external wiring structure are both recessed structures along the vertical direction of the shell. Therefore, the wiring structure of this utility model does not occupy additional space in the vertical direction of the shell, and such a setting does not occupy additional space in the width direction of the shell formed by the longitudinal and vertical directions of the shell relative to the module base shell. The space under the seat of an electric vehicle has a small length margin corresponding to the width direction of the shell, thereby avoiding the occurrence of squeezing and collision between this utility model and the physical components of the space under the seat during wiring, and ensuring the operating space for installation and maintenance. Attached Figure Description

[0013] Figure 1 This is an exploded view of the low-voltage battery pack according to an embodiment of the present invention; Figure 2 This is a top view schematic diagram of a thin low-voltage battery module according to an embodiment of the present invention; Figure 3 for Figure 2 Exploded view; Figure 4 This is a schematic diagram of the module base shell of an embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the module base shell of an embodiment of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the positive electrode adapter, negative electrode adapter, positive electrode output bus, and negative electrode output bus according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly of the cell end cap and the low-voltage cell pack according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the battery cell end cap according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the positive electrode current guide and the negative electrode current guide according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the series connection of the soft-pack battery cells according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the voltage acquisition board according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the side sealing end cap according to an embodiment of the present invention. Figure 1 ; Figure 13This is a schematic diagram of the side sealing end cap according to an embodiment of the present invention. Figure 2 ; Figure 14 This is a schematic diagram of the assembly of the auxiliary boss and the cell receiving cavity according to an embodiment of the present invention. Figure 15 This is a schematic diagram of an implementation other than the embodiments of this utility model. Figure 1 ; Figure 16 This is a schematic diagram of an embodiment other than the one described in this utility model. Figure 2 .

[0014] In the diagram: 100, Thin low-voltage battery module; B, Low-voltage cell pack; B1, Soft-pack cell; B11, Cell tab; C, Protective foam; P, Control circuit board; J, Module bottom cover; 10, Module base shell; D1, Base shell lengthwise; D2, Base shell heightwise; 10a, Cell housing cavity; 101a, Encapsulating layer; 102a, Side sealing layer; 103a, Bottom sealing layer; 10b, Circuit board housing cavity; 10c, Gas vent hole; 10d, Module mounting through hole; 10e, Countersunk hole; 11, Positive terminal block; 11a, Positive terminal post; 11b, Positive terminal pin; 12, Negative terminal block; 12a, Negative terminal post; 12b, Negative terminal... PIN pin, 13, positive output busbar, 13a, positive output PIN pin, 13b, positive output terminal, 14, negative output busbar, 14a, negative output PIN pin, 14b, negative output terminal, 15, side mounting part, 20, cell end cap, 20a, first through hole, 20b, second through hole, 20c, vent hole, 20d, tab through hole, 21, positive current guide, 21a, output part, 21b, current guide, 21c, current collector, 22, negative current guide, 30, voltage acquisition board, 31, acquisition nickel sheet, 40, side sealing end cap, 41, auxiliary boss, 42, fixing bracket, 421, rib part, 422, foot part, 43, continuous groove. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following embodiments, in conjunction with the accompanying drawings, provide a detailed description of the thin low-voltage battery module of this utility model. It should be noted that the description of these embodiments is intended to help understand this utility model, but does not constitute a limitation on this utility model.

[0016] The thin low-voltage battery module 100 in this embodiment includes a control circuit board P and a low-voltage battery cell pack B, specifically, as follows: Figure 1As shown, the low-voltage battery pack B includes multiple pouch cells B1 and protective foam C, with the protective foam C located on opposite sides of the pouch cells B1. The positive and negative terminals of the pouch cells B1 are both led out through cell tabs B11. In this embodiment, the positive and negative output tabs are cell tabs B11 of two different pouch cells B1, and the positive and negative output tabs correspond to the total terminal voltage of the multiple pouch cells B1. like Figure 2 and Figure 3 As shown, the thin low-voltage battery module 100 includes a module base shell 10, a cell end cover 20, a voltage acquisition board 30, and a side sealing end cover 40.

[0017] like Figure 4 and Figure 5 As shown, the module base shell 10 has a longitudinal direction D1 and a height direction D2, and the module base shell 10 has a cell receiving cavity 10a and a circuit board receiving cavity 10b formed inside.

[0018] The cell receiving cavity 10a and the circuit board receiving cavity 10b are distributed sequentially along the longitudinal direction D1 of the base shell. The cell receiving cavity 10a is used to accommodate the low-voltage cell pack B, and the circuit board receiving cavity 10b is used to accommodate the control circuit board P. The orthographic projection of the outline of the circuit board receiving cavity 10b along the longitudinal direction D1 of the base shell is located within the orthographic projection of the outline of the cell receiving cavity 10a along the longitudinal direction D1 of the base shell. Specifically, the solid parts of the module base shell 10 corresponding to the cell receiving cavity 10a and the circuit board receiving cavity 10b share a common planar bottom surface along the height direction D2 of the base shell. The height of the module base shell 10 along the height direction D2 of the base shell is greater than or equal to the height of the solid part of the module base shell 10 corresponding to the circuit board receiving cavity 10b. That is, the solid part of the module base shell 10 corresponding to the cell receiving cavity 10a completely blocks the solid part of the module base shell 10 corresponding to the circuit board receiving cavity 10b along the longitudinal direction D1 of the base shell.

[0019] The cell receiving cavity 10a opens to the outside at one end of the module base shell 10 along the length D1 direction, and the circuit board receiving cavity 10b opens to the outside at one side of the module base shell 10 along the height D2 direction. Specifically, the low-voltage cell pack B is inserted into the cell receiving cavity 10a along the length D1 direction of the base shell, and the control circuit board P is placed into the circuit board receiving cavity 10b along the height D2 direction of the base shell.

[0020] Specifically, the outer surface of the module base shell 10 also forms a gas vent hole 10c, a module mounting through hole 10d, and a wiring countersunk hole 10e. The gas vent hole 10c is located at the end of the module base shell 10 along the longitudinal direction D1. The circuit board receiving cavity 10b opens to the outside through the gas vent hole 10c. The gas vent hole 10c is used to promptly discharge gas from the inside of the module base shell 10 to the outside when the low-voltage battery pack B runs out of control and causes gas to escape, thus preventing gas from accumulating and causing an explosion. The module mounting through hole 10d and the wiring countersunk hole 10e are both countersunk hole structures extending along the height direction D2 of the base shell. The module mounting through hole 10d is... A recessed through-hole penetrating the cell housing cavity 10a is used to fix the module base shell 10 to the external fixing surface. A wiring countersunk hole 10e is formed on the upper surface of the module base shell 10 and is used to lead out the output positive and output negative terminals of the low-voltage cell pack B from the circuit board housing cavity 10b to the outside and connect to the 12VDC low voltage of the electric vehicle. In this embodiment, there are two wiring countersunk holes 10e, corresponding to the output positive and output negative terminals of the low-voltage cell pack B. The two wiring countersunk holes 10e are set along the length D1 of the base shell, and both wiring countersunk holes 10e are semi-open holes, both located on the same side edge of the module base shell 10.

[0021] Specifically, since the mass of the low-voltage battery pack B is much greater than that of the control circuit board P, in order to fix it more stably, the module mounting through hole 10d penetrates through the battery cell receiving cavity 10a, which strengthens the fixation of the physical part of the module base shell 10 corresponding to the low-voltage battery pack B. In this embodiment, the module base shell 10 has 5 fixing points, and the number of module mounting through holes 10d is two. Along the length D1 of the base shell, there is one fixing point at the end of the circuit board receiving cavity 10b, and the end of the battery cell receiving cavity 10a is covered by the side sealing end cap 40 along the length D1 of the base shell. The side sealing end cap 40 has two fixing points, so there are a total of four fixing points along the length D1 of the base shell for fixing the battery cell receiving cavity 10a.

[0022] The module housing 10 also has a positive electrode channel (not shown in the figure) and a negative electrode channel (not shown in the figure) that connect the cell receiving cavity 10a and the circuit board receiving cavity 10b.

[0023] like Figure 6 As shown, the circuit board receiving cavity 10b is provided with a positive electrode adapter 11, a negative electrode adapter 12, a positive electrode output 13, and a negative electrode output 14.

[0024] The positive terminal block 11 has a positive terminal 11a and a positive terminal PIN 11b; the negative terminal block 12 has a negative terminal 12a and a negative terminal PIN 12b; the positive output block 13 has a positive output PIN 13a and a positive output terminal 13b; and the negative output block 14 has a negative output PIN 14a and a negative output terminal 14b. Specifically, the positive terminal block 11, negative terminal block 12, positive output block 13, and negative output block 14 are mostly sheet metal parts embedded within the module base shell 10 of the corresponding circuit board receiving cavity 10b. The positive terminal 11a and positive terminal PIN 12b are... N pin 11b, negative terminal 12a and negative adapter pin 12b, positive output pin 13a and positive output terminal 13b, negative output pin 14a and negative output terminal 14b all protrude from the surface of the module base shell 10, and only the positive output terminal 13b and negative output terminal 14b are located in the two wiring countersunk holes 10e respectively. Furthermore, the positive output terminal 13b and negative output terminal 14b both extend along the height of the base shell towards D2, while the rest are located inside the circuit board receiving cavity 10b. The positive terminal 11a is located near the positive channel opening, and the negative terminal 12a is located near the negative channel opening.

[0025] like Figure 7 and Figure 8 As shown, the cell end cap 20 is attached to one side of the tab of the low-voltage cell pack B. The cell end cap 20 is located at the end of the cell receiving cavity 10a near the circuit board receiving cavity 10b. The cell end cap 20 is formed by injection molding.

[0026] The cell end cap 20 has a first through hole 20a, a second through hole 20b and a vent hole 20c, and a positive electrode guide 21 and a negative electrode guide 22 are provided on its surface. The positive output tab passes through the first via 20a, and the negative output tab passes through the second via 20b. Specifically, as shown... Figure 10 As shown, multiple pouch cells B1 are connected in series by welding cell tabs B11. The welded cell tabs B11 serve as intermediate tabs, forming a positive output tab, a negative output tab, and multiple intermediate tabs. The cell end cap 20 also has multiple tab through holes 20d, and the first through hole 20a, the second through hole 20b, and the tab through hole 20d are all rectangular through holes. Multiple intermediate tabs cooperate to pass through the tab through holes 20d.

[0027] like Figure 9As shown, both the positive electrode current bus 21 and the negative electrode current bus 22 have a continuous integrated output section 21a, a current bus 21b, and a current collector 21c. The output section 21a and the current collector 21c both protrude from the surface of the cell end cover 20. The current bus 21b is embedded inside the cell end cover 20. The two current collectors 21c are respectively adjacent to the first through hole 20a and the second through hole 20b. The positive output tab passes through the first through hole 20a and is bent and welded to the adjacent current collector 21c. The negative output tab passes through the second through hole 20b and is bent and welded to the adjacent current collector 21c. Specifically, the intermediate tab is also bent after passing through the tab through hole 20d.

[0028] like Figure 11 As shown, the voltage acquisition board 30 is mounted on the cell end cover 20. The voltage acquisition board 30 has multiple pairs of voltage acquisition nickel plates 31 and a communication module (not shown in the figure). The multiple pairs of voltage acquisition nickel plates 31 are used to acquire the voltage of multiple soft-pack cells B1 of the low-voltage cell pack B in real time. The communication module is used to transmit the voltage value corresponding to the acquired output voltage to the control circuit board P in the form of a signal. Specifically, the multiple voltage acquisition nickel plates 31 are electrically connected to the positive output tab, the negative output tab and multiple intermediate tabs, so as to acquire the terminal voltage of each soft-pack cell B1 of the low-voltage cell pack B in real time.

[0029] When gas leakage occurs in the soft-pack battery cell B1, the gas is discharged to the outside of the module base shell 10 through the vent hole 20c, the circuit board receiving cavity 10b, and the gas discharge hole 10c in sequence.

[0030] Specifically, the output portion 21a corresponding to the positive output tab passes through the positive channel into the circuit board receiving cavity 10b and is disposed on the positive terminal 11a. The positive adapter pin 11b and the positive output pin 13a are both electrically connected to the control circuit board P. The output portion 21a corresponding to the negative output tab passes through the negative channel into the circuit board receiving cavity 10b and is disposed on the negative terminal 12a. The negative adapter pin 12b and the negative output pin 14a are both electrically connected to the control circuit board P.

[0031] like Figure 12 and Figure 13 As shown, the side sealing end cap 40 covers the cell housing cavity 10a along the length D1 of the base shell.

[0032] The two sides of the side sealing end cap 40 have auxiliary bosses 41 and fixing brackets 42 respectively.

[0033] The auxiliary boss 41 extends along the length of the base shell to D1 and is inserted into the cell receiving cavity 10a. The inner wall of the cell receiving cavity 10a, the outer surface of the low-voltage cell pack B, and the surface of the auxiliary boss 41 are filled with potting glue to form a potting glue layer 101a extending along the length of the base shell to D1. Thus, the low-voltage cell pack B is positioned in the cell receiving cavity 10a. Specifically, the auxiliary boss 41 is inserted into the cell receiving cavity 10a, which greatly increases the mating length between the side sealing end cap 40 and the module base shell 10. Therefore, in the case of vibration of the module base shell 10, the side sealing end cap 40 is not easy to fall off the module base shell 10.

[0034] The fixed bracket 42 has an integral continuous rib portion 421 and a foot portion 422. The foot portion 422 has a fixing through hole for fixing to the external fixing surface. Specifically, when the module base shell 10 is in a vibration scenario, most of the vibration is exerted on the side sealing end cover 40 through the auxiliary boss 41, and this force is transmitted to the foot portion 422 through the rib portion 421 and then to the external fixing surface.

[0035] Specifically, such as Figure 14 As shown, to achieve a better sealing effect, a continuous groove 43 with the same surface as the auxiliary boss 41 is formed on the side sealing end cap 40. A sealing insert (not shown in the figure) for inserting into the continuous groove 43 is also formed on the opening of the cell receiving cavity 10a. Before the side sealing end cap 40 is combined with the module base shell 10, sealant is injected into the continuous groove 43, thereby forming a side sealant layer 102a in the continuous groove 43. When the sealing insert is inserted into the continuous groove 43, the side sealant layer 102a is squeezed and deformed, so that the cross-section is "U" shaped. In this embodiment The module base shell 10 corresponding to the circuit board receiving cavity 10b also has a board side fixing part 15 extending along the length D1 of the base shell. The board side fixing part 15 has the same structure as the fixing bracket 42, and the module bottom cover J also has a groove the same as the continuous groove 43. The opening of the circuit board receiving cavity 10b also has a piece with a sealing insert. So when the module bottom cover J is assembled with the module base shell 10, a bottom sealing adhesive layer 103a is injected into the groove of the module bottom cover J to form a bottom sealing adhesive layer 103a. Then the module bottom cover J is closed and sealed on the circuit board receiving cavity 10b.

[0036] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Various modifications or variations that can be made by those skilled in the art without creative effort within the scope of the appended claims are still within the scope of protection of this patent. For example, in this embodiment, the module base shell 10 is fixed by setting fixing points (plate side fixing part 15, foot plate part 422) at both ends along the length D1 of the base shell. However, in practical applications, such as Figure 15 and Figure 16As shown, a corresponding structure can also be provided on both sides of the module base shell 10 along the length D1 of the base shell to achieve fixation. The corresponding structure can be a fixing protrusion for fixing by sheet metal pressing, or a side fixing foot plate that is the same as the side fixing part 15.

Claims

1. A thin low-voltage battery module, comprising a control circuit board and a low-voltage battery cell pack, characterized in that, include: The module base shell has longitudinal and vertical dimensions. The module base shell forms cell housing cavities and circuit board housing cavities sequentially distributed along the longitudinal direction of the base shell. The cell housing cavities are used to house the low-voltage cell packs, and the circuit board housing cavities are used to house the control circuit board. Wherein, the orthographic projection of the outline of the circuit board receiving cavity along the longitudinal direction of the base shell is located within the orthographic projection of the outline of the cell receiving cavity along the longitudinal direction of the base shell.

2. The thin low-voltage battery module according to claim 1, characterized in that, Also includes: A side-sealed end cap covers the cell housing cavity along the longitudinal direction of the base shell. The two sides of the side sealing end cap are respectively provided with auxiliary bosses and fixing brackets. The auxiliary boss extends along the longitudinal direction of the base shell and is inserted into the cell receiving cavity. A potting compound is injected between the inner wall of the cell receiving cavity, the outer surface of the low-voltage cell pack, and the surface of the auxiliary boss, thereby forming a potting compound layer extending along the longitudinal direction of the base shell. The fixed bracket has an integral continuous rib portion and a foot portion, and the foot portion has a fixing through hole.

3. The thin low-voltage battery module according to claim 1, characterized in that: in, The module base shell also has a positive electrode channel, a negative electrode channel, and a module mounting through hole. The cell housing cavity is connected to the positive electrode channel, the negative electrode channel, and the circuit board housing cavity. The cell housing cavity opens outward at one longitudinal end of the module base shell, and the circuit board housing cavity opens outward on one vertical side of the module base shell. A positive output terminal and a negative output terminal are formed on the other vertical side of the module base shell, and both the positive and negative output terminals are recessed. The module mounting through hole is a recessed through hole extending along the height of the base shell.

4. The thin low-voltage battery module according to claim 3, characterized in that: in, The circuit board housing cavity is also equipped with a positive electrode adapter bar, a negative electrode adapter bar, a positive electrode output bar, and a negative electrode output bar. The positive terminal busbar has a positive terminal and a positive terminal PIN, the negative terminal busbar has a negative terminal and a negative terminal PIN, the positive output busbar has a positive output PIN and a positive output terminal, and the negative output busbar has a negative output PIN and a negative output terminal.

5. The thin low-voltage battery module according to claim 4, characterized in that, Also includes: Cell end caps, positive electrode busbars, and negative electrode busbars. The cell end cap is located at the end of the cell receiving cavity near the circuit board receiving cavity. The cell end cap is formed by injection molding and has a first through hole and a second through hole corresponding to the positive electrode channel and the negative electrode channel. Both the positive and negative electrode current-carrying busbars have a continuous, integrated current-collecting section, a current-guiding section, and an output section. The current-collecting section and the output section both protrude from the surface of the cell end cap. The current-guiding section is embedded inside the cell end cap, and the two current-collecting sections are respectively adjacent to the first via and the second via. The low-voltage battery cell comprises multiple pouch cells connected in series, and the low-voltage battery cell package has a positive output tab and a negative output tab. The positive output tab passes through the first through hole and is bent and welded to the adjacent current collector; the negative output tab passes through the second through hole and is bent and welded to the adjacent current collector.

6. The thin low-voltage battery module according to claim 5, characterized in that: in, The output portion corresponding to the positive output tab passes through the positive channel into the circuit board receiving cavity and is disposed on the positive terminal. Both the positive adapter pin and the positive output pin are electrically connected to the control circuit board. The output portion corresponding to the negative output tab passes through the negative channel into the circuit board receiving cavity and is disposed on the negative terminal. Both the negative adapter pin and the negative output pin are electrically connected to the control circuit board.

7. The thin low-voltage battery module according to claim 5, characterized in that: in, The end cap of the battery cell also has a vent hole, and the circuit board receiving cavity also has a gas discharge hole that is connected to the vent hole. The gas discharge hole is located at the longitudinal end of the module base shell and is open to the outside. When the soft-pack battery cell leaks gas, the gas is discharged to the outside through the vent hole, the circuit board receiving cavity, and the gas discharge hole in sequence.

8. The thin low-voltage battery module according to claim 5, characterized in that, Also includes: A voltage acquisition board is disposed on the end cover of the battery cell. The voltage acquisition board has multiple pairs of voltage acquisition nickel plates and a communication module. The multiple pairs of voltage acquisition nickel plates are used to acquire the voltage of multiple soft-pack battery cells in the low-voltage battery cell pack in real time. The communication module is used to transmit the voltage value corresponding to the acquired output voltage to the control circuit board in the form of a signal.

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