A battery pack
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU WENDIAN TECHNOLOGY CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-23
Smart Images
Figure CN224400549U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a battery pack. Background Technology
[0002] In the current era of rapid development in new energy technologies, lithium-ion batteries, with their superior energy conversion efficiency and cycle performance, have become the core driving force for innovation in new energy vehicles, energy storage power stations, and smart terminals. Among them, pouch battery modules, due to their aluminum-plastic composite membrane casing, possess significant advantages such as outstanding safety, high energy density, and long cycle life. Their market share in the power battery and high-end energy storage fields has been increasing year by year, making them a key technology direction for industry development.
[0003] However, pouch batteries generally face expansion problems when they reach the end of their long-term use. This end-stage expansion directly damages the geometric stability of the pouch battery casing: the planes, bosses or positioning holes originally used for installation and positioning will have shape and position deviations due to the overall bulging of the casing; the fit clearance between the casing and the module frame and fixing buckles is compressed or even eliminated, resulting in a "stuck" phenomenon during assembly. Utility Model Content
[0004] The purpose of this application is to provide a battery pack that can reserve space for battery expansion within the casing, thereby offsetting the battery expansion through the casing itself and improving assembly stability.
[0005] The embodiments of this application are implemented as follows:
[0006] This application provides a battery pack, including a housing, a pouch battery module housed within the housing, and a cover disposed on the housing. The pouch battery module includes multiple battery cells stacked sequentially along its thickness direction. A first inner liner plate and a second inner liner plate are disposed within the housing cavity to support the pouch battery module. The first inner liner plate and the second inner liner plate are located on opposite sides of the battery cell stacking direction, and a predetermined space is provided between the first inner liner plate and the inner wall of the housing.
[0007] Optionally, as an implementable approach, the pouch battery module further includes a circuit board and a battery management system. Each of the battery cells has a positive tab and a negative tab on one side. The circuit board is disposed on the side close to the positive tab and the negative tab. The battery management system is disposed above the battery cells. The positive tabs and negative tabs of multiple battery cells are connected in series on the circuit board. The battery management system and the circuit board are electrically connected.
[0008] Optionally, as an implementable method, the circuit board is provided with a plurality of wiring holes corresponding one-to-one with the positive and negative tabs of the battery cell, and the positive and negative tabs are respectively soldered to the circuit board after passing through the wiring holes.
[0009] Optionally, as an implementable method, the circuit board is provided with positive and negative terminals that are electrically connected to the battery cell, and the battery management system is electrically connected through the positive and negative terminals respectively.
[0010] Alternatively, as an implementable method, the battery management system is connected to the battery cell via a mounting plate having a tie bridge and a bending section, the bending section abutting against the side of the battery cell opposite to the positive electrode tab.
[0011] Optionally, as an implementable method, the battery management system is electrically connected to a signal interface and a power interface, the power interface being an Anderson interface, a mounting base is installed on the housing, the power interface is mounted through the mounting base, and the connection between the mounting slot of the mounting base and the power interface is sealed with glue.
[0012] Optionally, as an implementable method, the cover is further provided with a handle assembly, the handle assembly including a handle seat disposed on the cover and a handle rotatably connected to the handle seat, the handle having a stationary state that fits against the top surface of the cover and a lifting state that is set at an angle to the top surface of the cover.
[0013] Optionally, as an implementable method, the handle base is provided with a rectangular hole, and the handle is provided with a locking pin that mates with the rectangular hole. The locking pin is cylindrical, and a plane is cut into the side wall of the locking pin. When the plane corresponds to the clamping surface of the rectangular hole, the handle is in a stationary state, and there is a gap between the plane and the clamping surface of the rectangular hole.
[0014] Optionally, as an implementable method, the cover is provided with a display light module electrically connected to the battery management system, which displays the working status of the battery pack. The display light module includes a lamp board electrically connected to the battery management system, light guide columns corresponding to the lamp beads on the lamp board, and a light shield covering the lamp board. The light shield has openings corresponding to the light guide columns, and a grid is provided between two adjacent openings.
[0015] Alternatively, as an implementable method, the outer periphery of the pouch battery module is covered with foam, and the foam is covered with a plastic shell.
[0016] The beneficial effects of the embodiments of this application include:
[0017] The battery pack provided in this application includes a housing, a pouch battery module housed within the housing, and a cover covering the housing. The pouch battery module includes multiple battery cells stacked sequentially along its thickness direction. A first inner liner plate and a second inner liner plate are disposed within the housing cavity to support the pouch battery module. The first and second inner liner plates are located on opposite sides of the cell stacking direction, and each has a predetermined space between itself and the inner wall of the housing. By providing the first and second inner liner plates and the predetermined spaces between them and the inner wall of the housing, a dedicated space is provided to accommodate the eventual expansion of the pouch battery module. When the battery expands, it can push the inner liner plates to move, using the predetermined spaces to offset the expansion, preventing the housing from bulging due to expansion, protecting the geometric stability of the housing, and maintaining the accuracy of the mounting and positioning structures on the housing. Because the casing does not experience dimensional or positional deviations due to battery expansion, the fit clearance between the casing and the module frame and fixing clips remains stable, effectively preventing "jamming" during assembly, reducing assembly difficulty, improving assembly efficiency and quality, and ensuring the reliability of connections between various components of the battery pack. The expansion of the pouch battery module is reasonably accommodated, preventing damage to the casing structure from affecting the internal structure of the battery pack and maintaining the normal operating environment of the pouch battery module. At the same time, it reduces the compression of the cells caused by structural deformation, lowering the risk of cell damage and leakage, ensuring the overall performance and safety of the battery pack, and extending its service life. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;
[0020] Figure 2 This is a schematic diagram of the structure of the housing in the battery pack provided in an embodiment of this application;
[0021] Figure 3 This is a schematic diagram of the structure of the soft-pack battery module in the battery pack provided in the embodiments of this application;
[0022] Figure 4 This is a schematic diagram of the handle assembly in the battery pack provided in an embodiment of this application;
[0023] Figure 5 This is a schematic diagram of the structure of the display light module in the battery pack provided in an embodiment of this application.
[0024] Icons: 100-Battery pack; 110-Housing shell; 111-First inner liner; 112-Second inner liner; 113-Signal interface; 114-Power interface; 120-Soft pack battery module; 121-Battery cell; 122-Circuit board; 1221-Wiring hole; 1222-Positive terminal; 1223-Negative terminal; 123-Battery management system; 1231-Mounting plate; 124-Foam; 125-Plastic shell; 130-Cover; 140-Handle assembly; 141-Handle base; 1411-Rectangular hole; 142-Handle; 1421-Snap pin; 150-Indicator light module; 151-Light panel; 152-Light guide column; 153-Light shield. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0029] Please refer to Figure 1 , Figure 2 and Figure 3This embodiment provides a battery pack 100, including a housing 110, a soft-pack battery module 120 housed within the housing 110, and a cover 130 covering the housing 110. The soft-pack battery module 120 includes a plurality of battery cells 121, which are stacked sequentially along their thickness direction. A first inner liner plate 111 and a second inner liner plate 112 for supporting the soft-pack battery module 120 are provided in the cavity of the housing 110. The first inner liner plate 111 and the second inner liner plate 112 are located on both sides of the stacking direction of the battery cells 121, and the first inner liner plate 111 and the second inner liner plate 112 have a preset space between them and the inner wall of the housing 110.
[0030] Specifically, the housing 110 is made of high-strength, corrosion-resistant materials, such as aluminum alloy and engineering plastics, to ensure sufficient structural strength to accommodate the pouch battery module 120 and withstand the forces generated when the battery expands. The cover 130 is connected to the housing 110 by bolts, clips, or other means to ensure a tight connection and prevent dust, moisture, etc., from entering the interior of the housing 110 and affecting the operation of the pouch battery module 120. The first inner liner 111 and the second inner liner 112 are made of materials with a certain degree of elasticity and strength, such as elastic plastics and rubber composite boards. Their contact surfaces with the pouch battery module 120 are flat and smooth to ensure stable support for the pouch battery module 120 and to avoid scratches or other damage to the housing 110 of the pouch battery module 120.
[0031] The size of the preset space is determined based on the maximum expansion that the pouch battery module 120 may experience throughout its entire lifespan. During the design process, long-term charge-discharge cycle tests were conducted on the pouch battery module 120, and its expansion data at the end stage was recorded. After analysis and calculation, a suitable preset space size was obtained to ensure that the space can fully accommodate the battery's expansion.
[0032] When the pouch battery module 120 expands during long-term use, the expansion force acts on the first inner liner 111 and the second inner liner 112. Since there are preset spaces between the first inner liner 111 and the second inner liner 112 and the inner wall of the housing 110, the first inner liner 111 and the second inner liner 112 will move towards the inner wall of the housing 110 under the push of the expansion force. The preset spaces provide accommodation for this movement, thereby offsetting the expansion of the pouch battery module 120 and preventing the housing 110 from bulging and deforming due to the expansion force.
[0033] The battery pack 100 provided in this application includes a housing 110, a pouch battery module 120 housed within the housing 110, and a cover 130 covering the housing 110. The pouch battery module 120 includes multiple battery cells 121, which are stacked sequentially along their thickness direction. A first inner liner plate 111 and a second inner liner plate 112 are provided within the cavity of the housing 110 to support the pouch battery module 120. The first inner liner plate 111 and the second inner liner plate 112 are located on opposite sides of the stacking direction of the battery cells 121, and each has a predetermined space between it and the inner wall of the housing 110. By providing the first inner liner plate 111, the second inner liner plate 112, and the predetermined spaces between them and the inner wall of the housing 110, a dedicated space is provided to accommodate the eventual expansion of the pouch battery module 120. When the battery expands, it can push the inner liner to move, using the preset space to offset the expansion, avoiding bulging deformation of the housing 110 due to expansion, protecting the geometric stability of the housing 110, and maintaining the accuracy of the mounting and positioning structure on the housing 110. Since the housing 110 will not experience dimensional deviation due to battery expansion, the fit clearance between the housing 110 and the module frame and fixing buckles can remain stable, effectively avoiding "jamming" during assembly, reducing assembly difficulty, improving assembly efficiency and quality, and ensuring the reliability of the connections between the various components of the battery pack 100. The expansion of the soft-pack battery module 120 is reasonably accommodated, avoiding the impact of damage to the housing 110 structure on the internal structure of the battery pack 100, maintaining the normal operating environment of the soft-pack battery module 120. At the same time, it reduces the squeezing of the cell 121 caused by structural deformation, reducing the risk of cell 121 damage and leakage, ensuring the overall performance and safety of the battery pack 100, and extending the service life of the battery pack 100.
[0034] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the soft-pack battery module 120 also includes a circuit board 122 and a battery management system 123. Each cell 121 has a positive tab and a negative tab on one side. The circuit board 122 is located on the side close to the positive tab and the negative tab. The battery management system 123 is located above the cell 121. The positive tabs and negative tabs of multiple cells 121 are connected in series on the circuit board 122. The battery management system 123 and the circuit board 122 are electrically connected.
[0035] Furthermore, the circuit board 122 is provided with a plurality of wiring holes 1221 corresponding one-to-one with the positive and negative tabs of the battery cell 121. The positive and negative tabs pass through the wiring holes 1221 and are then soldered to the circuit board 122.
[0036] Furthermore, the circuit board 122 is provided with a positive terminal 1222 and a negative terminal 1223 that are respectively electrically connected to the battery cell 121, and the battery management system 123 is electrically connected through the positive terminal 1222 and the negative terminal 1223 respectively.
[0037] The battery cell 121 is soldered to the circuit board 122 through positive and negative tabs, and the wiring holes 1221 on the circuit board 122 correspond one-to-one with the positive and negative tabs. The positive and negative terminals 1223 connect to the battery management system 123. This connection method makes the connection between the battery cells 121 and between the battery cells 121 and the battery management system 123 more stable, has good conductivity, reduces the occurrence of problems such as poor contact, and ensures the stable operation of the circuit.
[0038] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the battery management system 123 is connected to the battery cell 121 through the mounting plate 1231. The mounting plate 1231 has a wire tie bridge and a bending section, and the bending section abuts against the side of the battery cell 121 away from the positive electrode tab.
[0039] Furthermore, the battery management system 123 is electrically connected to the signal interface 113 and the power interface 114. The power interface 114 is an Anderson interface. A mounting base is installed on the housing 110, through which the power interface 114 is installed. The connection between the mounting slot of the mounting base and the power interface 114 is sealed with glue.
[0040] In one possible embodiment of this application, such as Figure 1 and Figure 4 As shown, a handle assembly 140 is also provided on the cover 130. The handle assembly 140 includes a handle seat 141 provided on the cover 130 and a handle 142 rotatably connected to the handle seat 141. The handle 142 has a stationary state that is in contact with the top surface of the cover 130 and a lifting state that is set at an angle to the top surface of the cover 130.
[0041] Furthermore, the handle base 141 is provided with a rectangular hole 1411, and the handle 142 is provided with a locking pin 1421 that mates with the rectangular hole 1411. The locking pin 1421 is cylindrical, and a flat surface is cut into the side wall of the locking pin 1421. When the flat surface corresponds to the clamping surface of the rectangular hole 1411, the handle 142 is in a stationary state. There is a gap between the flat surface and the clamping surface of the rectangular hole 1411, and the curved surface and the clamping surface of the rectangular hole 1411 are interference-fitted. The reasonable clearance and interference design ensures stable switching of the handle 142 in different states, reduces wear on the locking pin 1421 and the rectangular hole 1411, extends the service life of the handle assembly 140, and reduces maintenance costs.
[0042] In one possible embodiment of this application, such as Figure 1 and Figure 5 As shown, a display module 150 electrically connected to the battery management system 123 is provided on the cover 130. The display module 150 displays the working status of the battery pack 100. The display module 150 includes a lamp board 151 electrically connected to the battery management system 123, light guide columns 152 corresponding to the LEDs on the lamp board 151, and a light shield 153 covering the lamp board 151. The light shield 153 has openings corresponding to the light guide columns 152, and a grid is provided between adjacent openings. The display module 150 can display multiple working statuses, and the light guide columns 152 ensure good light transmission. The design of the light shield 153 and the grid effectively prevents light crosstalk, making the display clearer and more accurate. Operators can quickly understand the operating status of the battery pack 100, which facilitates timely maintenance and management, improving the ease of use of the battery pack 100.
[0043] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the soft-pack battery module 120 is covered with foam 124 on its outer periphery, and a plastic shell 125 is fitted on the outside of the foam 124.
[0044] Foam 124 provides good cushioning performance, reducing damage to the battery cell 121 from external impacts; the anti-slip texture of the plastic shell 125 facilitates handling. This design enhances the protection of the soft-pack battery module 120 and extends the service life of the battery cell 121.
[0045] When the pouch battery module 120 expands during long-term use, the expansion force acts on the first inner liner plate 111 and the second inner liner plate 112. Since there are pre-set spaces between the first inner liner plate 111 and the second inner liner plate 112 and the inner wall of the housing 110, under the push of the expansion force, the first inner liner plate 111 and the second inner liner plate 112 will move towards the inner wall of the housing 110. The pre-set spaces provide accommodation for this movement, thereby offsetting the expansion of the pouch battery module 120 and preventing the housing 110 from bulging and deforming due to the expansion force. Regarding circuit connections, multiple battery cells 121 are connected in series through positive and negative tabs passing through the wiring holes 1221 on the circuit board 122 and soldered. They are then electrically connected to the battery management system 123 through the positive terminal 1222 and the negative terminal 1223 on the circuit board 122. The battery management system 123 monitors and manages the voltage, current, temperature, and other operating states of the battery cells 121 in real time, and promptly issues protection signals when abnormalities occur. The battery management system 123 is securely mounted above the battery cell 121 via a mounting plate 1231. The bent section of the mounting plate 1231 supports the battery cell 121, ensuring its installation stability. Simultaneously, the wire tie on the mounting plate 1231 organizes the wires, preventing tangled wires from affecting heat dissipation. The signal interface 113 and power interface 114 on the housing 110 are electrically connected to the battery management system 123. The signal interface 113 transmits the operating status data of the battery pack 100, and the power interface 114 outputs electrical energy. The potting seal at the power interface 114 ensures the interface's airtightness, preventing moisture ingress. The handle assembly 140, through the engagement of a locking pin 1421 and a rectangular hole 1411, allows the handle 142 to switch between a stationary state and a lifted state, facilitating the handling of the battery pack 100. Under the control of the battery management system 123, the indicator light module 150 emits light through different colored LEDs on the light panel 151, which are displayed through the light guide column 152 and the openings on the light shield 153, visually showing the working status of the battery pack 100. The foam 124 and plastic shell 125 around the soft-pack battery module 120 play a buffering and protective role, reducing the impact of external impacts on the battery cell 121.
[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery pack, characterized in that, The device includes a housing, a pouch battery module housed within the housing, and a cover disposed on the housing. The pouch battery module includes multiple battery cells stacked sequentially along its thickness direction. A first inner liner and a second inner liner are disposed within the housing cavity to support the pouch battery module. The first inner liner and the second inner liner are located on opposite sides of the battery cell stacking direction, and a predetermined space is provided between the first inner liner and the second inner liner and the inner wall of the housing, respectively.
2. The battery pack according to claim 1, characterized in that, The soft-pack battery module also includes a circuit board and a battery management system. Each battery cell has a positive tab and a negative tab on one side. The circuit board is located on the side close to the positive tab and the negative tab. The battery management system is located above the battery cell. The positive tabs and negative tabs of multiple battery cells are connected in series on the circuit board. The battery management system and the circuit board are electrically connected.
3. The battery pack according to claim 2, characterized in that, The circuit board has multiple wiring holes that correspond one-to-one with the positive and negative tabs of the battery cell. The positive and negative tabs pass through the wiring holes and are then soldered to the circuit board.
4. The battery pack according to claim 2, characterized in that, The circuit board is provided with positive and negative terminals that are electrically connected to the battery cell, and the battery management system is electrically connected through the positive and negative terminals.
5. The battery pack according to claim 2, characterized in that, The battery management system is connected to the battery cell via a mounting plate. The mounting plate has a wire tie and a bending section, and the bending section abuts against the side of the battery cell away from the positive electrode tab.
6. The battery pack according to claim 2, characterized in that, The housing is provided with a signal interface and a power interface that are electrically connected to the battery management system. The power interface is an Anderson interface. A mounting base is installed on the housing to mount the power interface. The mounting groove of the mounting base and the connection between the power interface are sealed with glue.
7. The battery pack according to claim 1, characterized in that, The cover is also provided with a handle assembly, which includes a handle seat on the cover and a handle rotatably connected to the handle seat. The handle has a stationary state that is in contact with the top surface of the cover and a lifting state that is set at an angle to the top surface of the cover.
8. The battery pack according to claim 7, characterized in that, The handle base is provided with a rectangular hole, and the handle is provided with a locking pin that mates with the rectangular hole. The locking pin is cylindrical, and a plane is cut into the side wall of the locking pin. When the plane corresponds to the clamping surface of the rectangular hole, the handle is in a stationary state. There is a gap between the plane and the clamping surface of the rectangular hole.
9. The battery pack according to claim 2, characterized in that, The cover is provided with a display light module electrically connected to the battery management system. The display light module displays the working status of the battery pack. The display light module includes a light board electrically connected to the battery management system, light guide columns corresponding to the lamps on the light board, and a light shield covering the light board. The light shield has openings corresponding to the light guide columns, and a grid is provided between two adjacent openings.
10. The battery pack according to claim 1, characterized in that, The outer periphery of each soft-pack battery module is covered with foam, and a plastic shell is fitted over the foam.