A battery case, a battery, and a battery system

Abstract

The application relates to a battery shell, a battery and a battery system, wherein the battery shell comprises two outer covers and at least one battery core seat between the two outer covers, the battery core seat is provided with a connecting structure connected with the two outer covers or adjacent battery core seats respectively; the battery core seat is provided with a partition wall, the partition wall divides the battery core seat into two battery core installation grooves, two sides of the partition wall are connected with positive poles or negative poles of two adjacent battery cores respectively to form an electronic conduction path of the battery core; the two outer covers are connected with positive poles or negative poles of the battery to form output positive poles or output negative poles of the battery; an insulating sealing body is arranged between the two adjacent battery core seats and between the battery core seat and the outer cover, and the insulating sealing body is used for realizing insulating and sealing cooperation between the two adjacent battery core seats or between the battery core seat and the outer cover. The application can reduce the electric connecting points between the two adjacent battery cores through the partition wall, is favorable for guaranteeing the process quality of battery manufacturing, and improves the consistency and the qualified rate of the battery.

Description

Technical Field

[0001] This invention belongs to the field of vehicle battery technology, specifically relating to a battery casing, a battery, and a battery system. Background Technology

[0002] The battery packs in electric vehicles are typically formed by assembling battery cells into modules, and then installing the modules into the battery pack. For example, the battery box disclosed in Chinese utility model patent CN214848776U represents a three-tiered assembly model: "cell-module-battery pack". In existing technologies, connecting battery cells in series or parallel requires methods such as laser welding, ultrasonic welding, and bolt connections using aluminum busbars. This creates numerous electrical connection points on the cells, increasing uncontrollable factors in battery quality and making it impossible to guarantee the quality of the battery manufacturing process, thereby reducing the product yield.

[0003] With the development of bipolar electrodes, they have been widely used in the battery field, resulting in the development of bipolar batteries. Existing bipolar batteries, such as those disclosed in the invention patent application publication number CN1757133A, include an electron conduction section (i.e., an isolation wall) and positive and negative active materials on each side of the isolation wall. Bipolar batteries are usually composed of multiple bipolar electrodes connected in series, with one end of each group ending with a positive electrode with a current outlet and the other end ending with a unipolar negative electrode with a current outlet.

[0004] If bipolar electrode technology could be applied to the modularization of battery cells into battery boxes, it would effectively alleviate the aforementioned problems of existing battery boxes. However, there is currently no relevant information on applying bipolar electrodes to battery modularization. Summary of the Invention

[0005] The purpose of this invention is to provide a battery casing that can reduce the number of electrical connection points between two adjacent cells; another purpose of this invention is to provide a battery and a battery system having the battery casing.

[0006] To achieve the above objectives, the battery casing of the present invention adopts the following technical solution:

[0007] A battery casing includes two outer covers and at least one cell holder located between the two outer covers. The cell holder has a connection structure that connects to the two outer covers or adjacent cell holders respectively. The cell holder has a partition wall that divides the cell holder into two opposing cell mounting slots along the depth direction of the cell holder. The cell mounting slots are used to mount cells. The two sides of the partition wall along the depth direction of the cell holder are respectively used to connect to the positive or negative terminals of the two adjacent cells to form an electronic conduction path for the cells. The two outer covers have connection portions for connecting to the positive or negative terminals of the battery, and the two outer covers respectively constitute the output positive or output negative terminals of the battery. An insulating seal is provided between the two adjacent cell holders and between the cell holder and the outer cover. The insulating seal is used to achieve an insulating and sealed fit between the two adjacent cell holders or between the cell holder and the outer cover.

[0008] The beneficial effects of the above technical solution are as follows: The battery casing of this invention not only allows for the mounting of battery cells via the cell mounting slots in the cell holder, but also enables the connection between adjacent cells and the isolation wall to form an electronic conduction path between the two cells, thus indirectly achieving the connection between two adjacent cells. Therefore, compared with the prior art, no additional components are needed to connect the two adjacent cells, which reduces the weight proportion of other components, thus increasing the battery's specific energy. It also increases the space ratio of the cells within the battery casing, further increasing the battery's volumetric energy. Furthermore, the isolation wall reduces the number of electrical connection points between adjacent cells, thereby reducing uncontrollable factors that could lower battery quality, ensuring the quality of the battery manufacturing process, and improving battery consistency and yield. In addition, the outer cover, serving as the positive and negative output terminals of the battery, strengthens the protection of the cells, while the insulating seal located between the casing and the cell holder, and between adjacent cell holders, further enhances the insulation and sealing protection inside the battery casing.

[0009] Furthermore, the connection structure includes edge-sealing grooves and connecting flanges disposed at both ends of the battery cell base along the depth direction of the battery cell base. The edge-sealing grooves are used to seal and connect with the connecting flanges of adjacent battery cell bases / outer covers, and the connecting flanges are used to seal and connect with the edge-sealing grooves of adjacent battery cell bases / outer covers.

[0010] The beneficial effects of the above technical solution are as follows: by sealing the connection between the edge groove and the connecting flange, the connection between two adjacent cell holders can be realized, and the reliability of the connection between two adjacent cell holders can be guaranteed, reducing the influence of external factors on the inside of the casing.

[0011] Furthermore, the insulating seal includes an elastic seal disposed between the edge groove and the connecting flange of the pier seal connection. The elastic seal is used to achieve a seal between the edge groove and the connecting flange by relying on its own rebound force when two adjacent cell seats are pressed together.

[0012] The beneficial effects of the above technical solution are as follows: the elastic seal can achieve insulation at the connection between the two cell holders, and the rebound force of the elastic seal can further improve the sealing at the connection between the two cell holders, thus further ensuring the sealing effect inside the battery casing.

[0013] Furthermore, at least one of the two outer covers is provided with a slot, and the insulating sealing body includes a sealing gasket or a sealing ring. The sealing ring is used to be engaged in the slot, and the sealing gasket is used to press between the outer cover and the battery cell holder.

[0014] The beneficial effects of the above technical solution are as follows: the sealing gasket or sealing ring can ensure the insulating and sealing fit between the outer cover and the cell holder, which is conducive to further ensuring the sealing effect inside the battery casing and reducing the impact of external factors on the battery casing.

[0015] Furthermore, the cell holder is a metal cell holder, or the cell holder is a composite material cell holder containing conductive portions for connecting to the positive / negative terminals of the cell.

[0016] The beneficial effects of the above technical solution are that, by using a metal cell holder or a composite material cell holder, both the conductivity and solderability of the cell holder can be guaranteed.

[0017] Furthermore, the composite material battery cell holder includes a metal portion constituting the conductive portion and a non-metallic portion sealed and connected to the metal portion; alternatively, the composite material battery cell holder is an integrally injection-molded structure.

[0018] The beneficial effects of the above technical solution are as follows: by using the metal part and the non-metal part that is sealed and connected to the metal part, the metal part can realize the conductivity function of the cell holder, while the non-metal part can reduce the weight of the entire cell holder, thereby reducing the weight of the entire battery and making it easier to use the battery.

[0019] Furthermore, the isolation wall and other parts of the battery cell holder are welded / riveted / pressed together, or the isolation wall and other parts of the battery cell holder are integrally stretched and formed.

[0020] The beneficial effects of the above technical solution are as follows: by welding / riveting / pressing the isolation wall to the other parts of the cell holder, only the isolation wall needs to be replaced when it is damaged, instead of replacing the entire cell holder, which can reduce costs; the isolation wall and the other parts of the cell holder are integrally stretched and formed, which can ensure the integrity of the cell holder and avoid increasing the uncontrollable factors in the overall quality of the cell holder due to the connection between the isolation wall and the other parts of the cell holder, thus helping to ensure the quality of the cell holder.

[0021] To achieve the above objectives, the battery in this invention adopts the following technical solution:

[0022] A battery includes a battery casing and a battery cell installed within the battery casing. The battery cell has an electrode serving as either a positive or negative electrode. The battery casing includes two outer covers and at least one battery cell holder located between the two outer covers. The battery cell holder has a connection structure that connects to the two outer covers or adjacent battery cell holders respectively. The battery cell holder has a partition wall that divides the battery cell holder along its depth direction into two opposing battery cell mounting slots. The battery cell mounting slots are used to mount the battery cells. The partition wall is connected to the positive or negative electrode of the two adjacent battery cells on both sides along the depth direction of the battery cell holder to form an electronic conduction path for the battery cells. The two outer covers have connection portions for connecting to the positive or negative electrode of the battery, and the two outer covers respectively constitute the output positive or output negative electrode of the battery. An insulating seal is provided between two adjacent battery cell holders and between the battery cell holder and the outer cover, and the insulating seal is used to achieve an insulating and sealed fit between two adjacent battery cell holders or between the battery cell holder and the outer cover.

[0023] The beneficial effects of the above technical solution are as follows: The battery in this invention, through its battery casing, not only allows the battery cells to be installed via the cell mounting slots in the cell holder, but also enables the connection between adjacent cells via the isolation wall, forming an electronic conduction path between the two cells. This indirectly achieves the connection between two adjacent cells. Therefore, compared with existing technologies, no additional components are needed to connect the two adjacent cells, reducing the weight proportion of other components, which is beneficial for increasing the battery's specific energy. It also increases the space ratio of the cells within the battery casing, which is beneficial for increasing the battery's volumetric energy. Furthermore, the isolation wall reduces the number of electrical connection points between adjacent cells, thereby reducing uncontrollable factors that could lower battery quality, ensuring the quality of the battery manufacturing process, and improving battery consistency and yield. In addition, the outer cover, serving as the positive and negative output terminals of the battery, strengthens the protection of the cells. Furthermore, the insulating seal located between the outer casing and the cell holder, as well as between adjacent cell holders, further enhances the insulation and sealing protection inside the battery casing.

[0024] Furthermore, the connection structure includes edge-sealing grooves and connecting flanges disposed at both ends of the battery cell base along the depth direction of the battery cell base. The edge-sealing grooves are used to seal and connect with the connecting flanges of adjacent battery cell bases / outer covers, and the connecting flanges are used to seal and connect with the edge-sealing grooves of adjacent battery cell bases / outer covers.

[0025] The beneficial effects of the above technical solution are as follows: by sealing the connection between the edge groove and the connecting flange, the connection between two adjacent cell holders can be realized, and the reliability of the connection between two adjacent cell holders can be guaranteed, reducing the influence of external factors on the inside of the casing.

[0026] Furthermore, the insulating seal includes an elastic seal disposed between the edge groove and the connecting flange of the pier seal connection. The elastic seal is used to achieve a seal between the edge groove and the connecting flange by relying on its own rebound force when two adjacent cell seats are pressed together.

[0027] The beneficial effects of the above technical solution are as follows: the elastic seal can achieve insulation at the connection between the two cell holders, and the rebound force of the elastic seal can further improve the sealing at the connection between the two cell holders, thus further ensuring the sealing effect inside the battery casing.

[0028] Furthermore, at least one of the two outer covers is provided with a slot, and the insulating sealing body includes a sealing gasket or a sealing ring. The sealing ring is used to be engaged in the slot, and the sealing gasket is used to press between the outer cover and the battery cell holder.

[0029] The beneficial effects of the above technical solution are as follows: the sealing gasket or sealing ring can ensure the insulating and sealing fit between the outer cover and the cell holder, which is conducive to further ensuring the sealing effect inside the battery casing and reducing the impact of external factors on the battery casing.

[0030] Furthermore, the cell holder is a metal cell holder, or the cell holder is a composite material cell holder containing conductive portions for connecting to the positive / negative terminals of the cell.

[0031] The beneficial effects of the above technical solution are that, by using a metal cell holder or a composite material cell holder, both the conductivity and solderability of the cell holder can be guaranteed.

[0032] Furthermore, the composite material battery cell holder includes a metal portion constituting the conductive portion and a non-metallic portion sealed and connected to the metal portion; alternatively, the composite material battery cell holder is an integrally injection-molded structure.

[0033] The beneficial effects of the above technical solution are as follows: by using the metal part and the non-metal part that is sealed and connected to the metal part, the metal part can realize the conductivity function of the cell holder, while the non-metal part can reduce the weight of the entire cell holder, thereby reducing the weight of the entire battery and making it easier to use the battery.

[0034] Furthermore, the isolation wall and other parts of the battery cell holder are welded / riveted / pressed together, or the isolation wall and other parts of the battery cell holder are integrally stretched and formed.

[0035] The beneficial effects of the above technical solution are as follows: by welding / riveting / pressing the isolation wall to the other parts of the cell holder, only the isolation wall needs to be replaced when it is damaged, instead of replacing the entire cell holder, which can reduce costs; the isolation wall and the other parts of the cell holder are integrally stretched and formed, which can ensure the integrity of the cell holder and avoid increasing the uncontrollable factors in the overall quality of the cell holder due to the connection between the isolation wall and the other parts of the cell holder, thus helping to ensure the quality of the cell holder.

[0036] Furthermore, the electrodes of the battery cell are welded to the isolation wall.

[0037] The beneficial effects of the above technical solution are as follows: welding can ensure the reliability of the electrode connection between the separator and the cell, which can relatively extend the service life of the entire battery, ensure the quality of the entire battery, and at the same time avoid the phenomenon of tip discharge caused by bolt connection.

[0038] Furthermore, the electrode includes a tab and an adapter plate connected to the tab, the adapter plate being arranged parallel to the isolation wall.

[0039] The beneficial effects of the above technical solution are that the adapter plate arranged parallel to the isolation plate not only facilitates the connection between the battery cell and the isolation wall, but also increases the electron conduction path between two adjacent battery cells.

[0040] Furthermore, a first insulating material or a first insulating structure is provided between the adapter piece and the electrode tab connected to the adapter piece, the first insulating material or the first insulating structure being used to achieve insulation isolation between the adapter piece and the electrode tab.

[0041] The beneficial effect of the above technical solution is that the first insulating material or the first insulating structure can prevent short circuits between the adapter piece and the battery cell, thus ensuring the normal operation of the battery.

[0042] Furthermore, a second insulating material or a second insulating structure is provided between the electrodes of the battery cell and the battery casing, the second insulating material or the second insulating structure being used to achieve electrical isolation between the electrodes and the battery casing.

[0043] The beneficial effect of the above technical solution is that the second insulating material or the second insulating structure can prevent short circuits between the electrodes of the battery cell and the battery casing, thereby further ensuring the normal operation of the battery.

[0044] To achieve the above objectives, the battery system of this invention adopts the following technical solution:

[0045] A battery system includes a battery housing and at least two batteries connected in series / parallel within the battery housing. Each battery includes a battery casing and battery cells installed within the casing. Each battery cell has an electrode serving as either a positive or negative electrode. The battery casing includes two outer covers and at least one battery cell holder located between the two outer covers. Each battery cell holder has a connection structure that connects to either of the two outer covers or an adjacent battery cell holder. Each battery cell holder has a partition wall that divides the battery cell holder along its depth direction into two opposing battery cell mounting slots. These mounting slots are used to mount battery cells. The partition wall connects to the positive or negative electrodes of two adjacent battery cells on both sides along the depth direction of the battery cell holder, respectively, to form an electronic conduction path for the battery cells. The two outer covers have connection portions for connecting to the positive or negative electrodes of the battery, and the two outer covers respectively constitute the positive or negative output electrodes of the battery. An insulating seal is provided between adjacent battery cell holders and between a battery cell holder and an outer cover, the insulating seal being used to achieve an insulating and sealed fit between adjacent battery cell holders or between a battery cell holder and an outer cover.

[0046] The beneficial effects of the above technical solution are as follows: The battery system of this invention, through the battery casing, not only allows for the installation of battery cells via the cell mounting slots in the cell holder, but also enables the formation of an electronic conduction path between two adjacent cells through the connection of the isolation wall. This indirectly achieves the connection between two adjacent cells. Therefore, compared with existing technologies, no additional components are needed to connect two adjacent cells, which reduces the weight proportion of other components, thus increasing the battery's specific energy. It also increases the space ratio of the cells within the battery casing, further increasing the battery's volumetric energy. Furthermore, the isolation wall reduces the number of electrical connection points between adjacent cells, thereby reducing uncontrollable factors that could lower battery quality, ensuring the quality of the battery manufacturing process, and improving battery consistency and yield. In addition, the outer cover, serving as the positive and negative output terminals, strengthens the protection of the cells, while the insulating seals located between the casing and the cell holder, and between adjacent cell holders, further enhance the insulation and sealing protection inside the battery casing.

[0047] Furthermore, the connection structure includes edge-sealing grooves and connecting flanges disposed at both ends of the battery cell base along the depth direction of the battery cell base. The edge-sealing grooves are used to seal and connect with the connecting flanges of adjacent battery cell bases / outer covers, and the connecting flanges are used to seal and connect with the edge-sealing grooves of adjacent battery cell bases / outer covers.

[0048] The beneficial effects of the above technical solution are as follows: by sealing the connection between the edge groove and the connecting flange, the connection between two adjacent cell holders can be realized, and the reliability of the connection between two adjacent cell holders can be guaranteed, reducing the influence of external factors on the inside of the casing.

[0049] Furthermore, the insulating seal includes an elastic seal disposed between the edge groove and the connecting flange of the pier seal connection. The elastic seal is used to achieve a seal between the edge groove and the connecting flange by relying on its own rebound force when two adjacent cell seats are pressed together.

[0050] The beneficial effects of the above technical solution are as follows: the elastic seal can achieve insulation at the connection between the two cell holders, and the rebound force of the elastic seal can further improve the sealing at the connection between the two cell holders, thus further ensuring the sealing effect inside the battery casing.

[0051] Furthermore, at least one of the two outer covers is provided with a slot, and the insulating sealing body includes a sealing gasket or a sealing ring. The sealing ring is used to be engaged in the slot, and the sealing gasket is used to press between the outer cover and the battery cell holder.

[0052] The beneficial effects of the above technical solution are as follows: the sealing gasket or sealing ring can ensure the insulating and sealing fit between the outer cover and the cell holder, which is conducive to further ensuring the sealing effect inside the battery casing and reducing the impact of external factors on the battery casing.

[0053] Furthermore, the cell holder is a metal cell holder, or the cell holder is a composite material cell holder containing conductive portions for connecting to the positive / negative terminals of the cell.

[0054] The beneficial effects of the above technical solution are that, by using a metal cell holder or a composite material cell holder, both the conductivity and solderability of the cell holder can be guaranteed.

[0055] Furthermore, the composite material battery cell holder includes a metal portion constituting the conductive portion and a non-metallic portion sealed and connected to the metal portion; alternatively, the composite material battery cell holder is an integrally injection-molded structure.

[0056] The beneficial effects of the above technical solution are as follows: by using the metal part and the non-metal part that is sealed and connected to the metal part, the metal part can realize the conductivity function of the cell holder, while the non-metal part can reduce the weight of the entire cell holder, thereby reducing the weight of the entire battery and making it easier to use the battery.

[0057] Furthermore, the isolation wall and other parts of the battery cell holder are welded / riveted / pressed together, or the isolation wall and other parts of the battery cell holder are integrally stretched and formed.

[0058] The beneficial effects of the above technical solution are as follows: by welding / riveting / pressing the isolation wall to other parts of the cell holder, only the isolation wall needs to be replaced when it is damaged, instead of replacing the entire cell holder, which can reduce costs; the isolation wall and other parts of the cell holder are integrally stretched and formed, which can ensure the integrity of the cell holder and avoid increasing the uncontrollable factors in the overall quality of the cell holder due to the connection between the isolation wall and other parts of the cell holder, thus helping to ensure the quality of the cell holder.

[0059] Furthermore, the electrodes of the battery cell are welded to the isolation wall.

[0060] The beneficial effects of the above technical solution are as follows: welding can ensure the reliability of the electrode connection between the separator and the cell, which can relatively extend the service life of the entire battery, ensure the quality of the entire battery, and at the same time avoid the phenomenon of tip discharge caused by bolt connection.

[0061] Furthermore, the electrode includes a tab and an adapter plate connected to the tab, the adapter plate being arranged parallel to the isolation wall.

[0062] The beneficial effects of the above technical solution are that the adapter plate arranged parallel to the isolation plate not only facilitates the connection between the battery cell and the isolation wall, but also increases the electron conduction path between two adjacent battery cells.

[0063] Furthermore, a first insulating material or a first insulating structure is provided between the adapter piece and the electrode tab connected to the adapter piece, the first insulating material or the first insulating structure being used to achieve insulation isolation between the adapter piece and the electrode tab.

[0064] The beneficial effect of the above technical solution is that the first insulating material or the first insulating structure can prevent short circuits between the adapter piece and the battery cell, thus ensuring the normal operation of the battery.

[0065] Furthermore, a second insulating material or a second insulating structure is provided between the electrodes of the battery cell and the battery casing, the second insulating material or the second insulating structure being used to achieve electrical isolation between the electrodes and the battery casing.

[0066] The beneficial effect of the above technical solution is that the second insulating material or the second insulating structure can prevent short circuits between the electrodes of the battery cell and the battery casing, thereby further ensuring the normal operation of the battery.

[0067] Furthermore, the battery casing is provided with insulating material or insulating and flame-retardant material located between the battery casing and the battery box.

[0068] The beneficial effects of the above technical solution are that: not only can the insulating material prevent the formation of a discharge circuit between the battery and the battery box, ensuring the normal operation of the entire battery system, but the flame-retardant material can also reduce the probability of the battery being burned.

[0069] Furthermore, a heat insulation element is provided between each two adjacent batteries.

[0070] The beneficial effects of the above technical solution are: by using heat insulation components, heat diffusion between batteries can be prevented, thereby improving the safety performance of the battery system. Attached Figure Description

[0071] Figure 1 This is a schematic diagram of the battery box in this invention;

[0072] Figure 2 This is an exploded view of the battery in this invention;

[0073] Figure 3 This is a perspective view of the cell holder in the battery casing of the present invention;

[0074] Figure 4 This is a schematic diagram of the cell holder in the battery casing of the present invention;

[0075] Figure 5 yes Figure 4 A magnified view of part A in the middle;

[0076] Figure 6 This is a diagram showing the state of the battery cell when it is installed in the battery cell holder in this invention;

[0077] Figure 7 yes Figure 6 A magnified view of part B in the middle section;

[0078] Figure 8 This is a cross-sectional view of a battery in this invention, which consists of multiple cells connected in series.

[0079] Figure 9 yes Figure 8 A magnified view of a portion of the image.

[0080] In the diagram: 10. Battery housing; 11. Positive connector; 12. Negative connector; 20. Cell holder; 21. First edge groove; 22. First connecting flange; 23. Cell mounting slot; 24. Insulating wall; 30. First outer cover; 31. Second edge groove; 40. Second outer cover; 41. Second connecting flange; 50. Cell; 51. Tab; 52. Adapter; 60. Conductive metal busbar; 70. First battery; 80. Second battery; 90. Third battery; 100. Fourth battery; 110. Sealing ring; 120. Elastic seal. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0082] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0083] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" 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, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0085] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0086] The present invention will be further described in detail below in conjunction with embodiments.

[0087] Embodiment 1 of the battery system in the present invention:

[0088] As Figure 1 described, the battery system includes a battery box 10 and four batteries installed in the battery box 10. Among them, the four batteries are arranged in a "field" shape in the battery box 10, and the four batteries are the first battery 70, the second battery 80, the third battery 90, and the fourth battery 100 respectively. A positive electrode connector 11 and a negative electrode connector 12 are provided on the battery box 10. Among them, the positive electrode connector 11 is connected to the positive electrode of the first battery 70 through a conductive metal row 60, the negative electrode connector 12 is connected to the negative electrode of the fourth battery 100 through a conductive metal row 60, and between the negative electrode of the first battery 70 and the positive electrode of the second battery 80, between the negative electrode of the second battery 80 and the positive electrode of the third battery 90, and between the negative electrode of the third battery 90 and the positive electrode of the fourth battery 100 are also connected through the conductive metal row 60. Thus, the four batteries can be connected in series through the conductive metal row 60. In this embodiment, the connection between the conductive metal row 60 and the battery and the connection between the conductive metal row 60 and the positive electrode connector 11 and the negative electrode connector 12 are all laser welding connections. However, in other embodiments, it can also be ultrasonic welding or bolt connection, etc. In addition, isolation, heat insulation parts and insulating materials are arranged between adjacent two batteries to prevent heat diffusion between the batteries and improve the installation performance of the battery system. In addition, the battery in the present invention is a bipolar battery based on bipolar electrodes.

[0089] As Figure 2 shown, the battery further includes a battery case, and an insulating and flame-retardant protective material is provided outside the battery case and between the battery case and the battery box 10. Thus, an electric discharge loop can be prevented from being formed between the battery case and the battery box 10 through the insulating material, ensuring the normal operation of the entire battery system. At the same time, the battery can be better protected from being burned by the flame-retardant material, reducing the probability of being burned. Among them, the insulating material includes PI type, PP type, etc., and its insulation resistance meets the technical requirements of relevant national standards, industry standards, and relevant enterprise standards.

[0090] As Figure 2 shown, the battery case includes a first outer cover 30, a second outer cover 40, and at least one cell seat 20 located between the two outer covers. The specific number of cell seats 20 needs to be designed according to specific usage requirements. For example, a battery can include seven cell seats 20 ( Figure 8 and Figure 9 shown), or it can only include one cell seat 20 ( Figure 4 and Figure 5 shown), and in this embodiment, the cell seat 20 is a metal cell seat 20.

[0091] like Figure 3 , Figure 4 as well as Figure 5 As shown, the cell holder 20 has a partition wall 24, which divides the cell holder 20 into two opposing cell mounting slots 23 along the depth direction of the cell holder 20. The partition wall 24 is integrally formed with the other parts of the cell holder 20 by metal stretching. Figure 6 , Figure 7 , Figure 8 as well as Figure 9 As shown, a battery cell 50 is installed in the battery cell mounting slot 23. The battery cell 50 has an electrode that serves as either a positive or negative electrode, and the electrode includes a tab 51 and a connector 52 connected to the tab 51. The tabs 51 on the positive and negative electrodes of the battery cell 50 extend in opposite directions, perpendicular to the separator wall 24. The connector 52 has current-carrying capacity during normal operation. The connectors 52 on the positive and negative electrodes of the battery cell 50 extend relative to each other and are located on opposite sides of the battery cell 50 along the depth direction of the battery cell base 20. The connectors 52 and the separator wall 24 are arranged in parallel and connected to each other. The separator wall 24 can be connected to the positive and negative electrodes of the battery cells 50 on both sides through the connectors 52 on its two sides, forming an electron conduction path between the positive and negative electrodes of two adjacent battery cells 50. The connector 52 has a high-current discharge function under needle penetration conditions, thereby improving the battery's safety performance. In this embodiment, the connection between the adapter piece 52 and the isolation wall 24, as well as the connection between the adapter piece 52 and the electrode tab 51, are made by ultrasonic welding. In other embodiments, the connection between the adapter piece 52 and the isolation wall 24 can also be made by laser welding. Furthermore, a first insulating material is provided between the adapter piece 52 and the first outer cover 30, and between the adapter piece 52 and the second outer cover 40. This first insulating material prevents short circuits between the two adapter pieces 52 and the first and second outer covers 30 respectively, ensuring the normal operation of the battery. A second insulating material is provided between the electrodes of the cell 50 and the battery casing. This second insulating material prevents short circuits between the electrodes of the cell 50 and the battery casing, further ensuring the normal operation of the battery.

[0092] like Figure 3 and Figure 4As shown, the battery cell holder 20 has a first edge groove 21 and a first connecting flange 22 on both ends along its depth direction. When the battery cell 50 includes multiple battery cell holders 20, the first edge groove 21 is sealed to the first connecting flange 22 of the adjacent battery cell holder 20, and the first connecting flange 22 is sealed to the first edge groove 21 of the adjacent battery cell holder 20. An elastic sealing element 120 is provided between the first edge groove 21 and the first connecting flange 22 that are sealed to each other. When two adjacent battery cell holders 20 are pressed together, the elastic sealing element 120 achieves the insulation seal between the first edge groove 21 and the first connecting flange 22 by its own rebound force. That is, the elastic sealing element 120 constitutes the insulation seal between two adjacent battery cell holders 20.

[0093] like Figure 7 and Figure 9 As shown, the first outer cover 30 is provided with a second edge groove 31, and the second outer cover 40 is provided with a second connecting flange 41. This allows the two outer covers to be connected to adjacent cell holders 20 via the sealing connection of the first edge groove 21 and the second connecting flange 41, and via the sealing connection of the second edge groove 31 and the first connecting flange 22. Furthermore, a sealing ring 110 is provided between each of the two outer covers and the adjacent cell holder 20, and each of the two outer covers also has a slot (not shown in the figure) for securing the sealing ring 110. When the two outer covers are sealed to their respective adjacent cell holders 20, the two sealing rings 110 are respectively pressed... The sealing ring 110 is tightly positioned between the first sealing groove 21 and the second connecting flange 41, and between the second sealing groove 31 and the first connecting flange 22. This allows for an insulating and sealed fit between the outer cover and the cell holder. In this embodiment, the sealing ring 110 is made of PP. In other embodiments, the sealing ring 110 can be made of PVC or PI, etc. The compression ratio of the sealing ring 110 ranges from 1% to 100%, with a preferred value of 10% to 50%. This compression ratio ensures effective sealing. Additionally, each of the two outer covers has a connection portion (not shown in the figure) that connects to the positive or negative terminal of the cell 50. One of the two outer covers connects to the positive terminal of the adjacent cell 50 via the aforementioned connection portion, forming the positive output terminal of the battery. The other outer cover connects to the negative terminal of the adjacent cell 50 via the aforementioned connection portion, forming the negative output terminal of the battery.

[0094] In addition, the casing of cell 50 is equipped with an explosion-proof valve (not shown in the figure) and an electrolyte injection port (not shown in the figure), both communicating with the inside of the cell. The explosion-proof valve prevents the cell from exploding due to increased internal pressure under abnormal conditions, and is sealed to the casing of cell 50 using laser welding. The electrolyte injection port is used for adding electrolyte and venting gas from the cell, and is equipped with a sealing plate. After electrolyte injection, the sealing plate at the injection port is laser-welded to the casing of cell 50 at the injection port location. The battery is also equipped with temperature, voltage, and pressure monitoring units to facilitate monitoring of the battery's status and ensure safe use.

[0095] In this invention, the battery system, through the battery casing, not only allows the battery cells to be installed via the cell mounting slots in the cell holder, but also enables the electronic conduction path between two adjacent cells through the connection of the isolation wall. This indirectly achieves the connection between two adjacent cells. Therefore, compared with the prior art, no additional components are needed to connect two adjacent cells. This reduces the weight proportion of other components, which is beneficial to increasing the battery's specific energy. It also increases the space ratio of the cells within the battery casing, which is beneficial to increasing the battery's volumetric energy. Furthermore, the isolation wall reduces the number of electrical connection points between two adjacent cells, thereby reducing uncontrollable factors that reduce battery quality, ensuring the quality of the battery manufacturing process, and improving battery consistency and yield.

[0096] Example 2 of the battery system in this invention:

[0097] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the electrode includes a tab 51 and an adapter piece 52 connected to the tab 51, and the tab 51 is connected to the isolation wall 24 through the adapter piece 52. In this embodiment, the electrode only includes the tab 51, and the tab 51 is directly connected to the isolation wall 24.

[0098] Example 3 of the battery system in this invention:

[0099] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the isolation wall 24 and the other parts of the cell holder 20 are integrally formed by metal stretching. In this embodiment, the isolation wall 24 and the other parts of the cell holder 20 are connected by riveting or pressing.

[0100] Example 4 of the battery system in this invention:

[0101] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the cell holder 20 is a metal cell holder 20. In this embodiment, the cell holder 20 is a composite material cell holder 20 that includes conductive portions for connecting to the positive / negative terminals of the cell 50. The composite material cell holder 20 includes a metal portion for constituting the aforementioned portion and a non-metallic portion that is sealed and connected to the metal portion. Alternatively, the composite material cell holder 20 may be an integrally injection-molded structure.

[0102] Example 5 of the battery system in this invention:

[0103] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, both outer covers have a sealing ring 110 located between the outer cover and the cell holder 20 via a slot. In this embodiment, the two outer covers are respectively pressed with a sealing gasket between them and their respective adjacent cell holders 20, or one of the two outer covers has a sealing ring 110 located between it and the cell holder 20 via a slot, and the other has a sealing gasket pressed between it and its adjacent cell holder 20.

[0104] Example 6 of the battery system in this invention:

[0105] The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, a first insulating material is provided between the adapter piece 52 and the electrode 51 connected to the adapter piece 52. In this embodiment, an insulating gap, serving as a first insulating structure, is provided between the adapter piece 52 and the electrode 51 connected to the adapter piece 52.

[0106] Example 7 of the battery system in this invention:

[0107] The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, a second insulating material is provided between the electrodes of the cell 50 and the battery casing. In this embodiment, an insulating gap, serving as a second insulating structure, is provided between the electrodes of the cell 50 and the battery casing.

[0108] Example 8 of the battery system in this invention:

[0109] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the battery casing has insulating and flame-retardant materials located between the battery casing and the battery box 10. In this embodiment, the battery casing has only insulating material located between the battery casing and the battery box 10.

[0110] The battery embodiment of the present invention: The specific structure of the battery is the same as that of the battery in the above battery system embodiment, and will not be repeated here.

[0111] An embodiment of the battery casing in this invention: The specific structure of the battery casing is the same as that of the battery casing in the above-described battery system embodiment, and will not be repeated here.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A battery case characterized by comprising: The battery includes two outer covers and at least one cell seat between the two outer covers, the cell seat has a connecting structure connected with the two outer covers or adjacent cell seats respectively; the cell seat has a partition wall, the partition wall separates the cell seat into two oppositely arranged cell mounting grooves along the depth direction of the cell seat, the cell mounting groove is used for mounting the cell, and the two sides of the partition wall along the depth direction of the cell seat are respectively used for connecting with the positive electrode or the negative electrode of the adjacent two cells to form an electronic conduction path of the cell; the two outer covers have a connecting part used for connecting with the positive electrode or the negative electrode of the battery, and the two outer covers respectively form the output positive electrode or the output negative electrode of the battery; an insulating sealing body is arranged between the two adjacent cell seats and between the cell seat and the outer cover, and the insulating sealing body is used for realizing the insulating sealing cooperation between the two adjacent cell seats or between the cell seat and the outer cover.

2. The battery case according to claim 1, wherein The connecting structure includes a wrapping groove and a connecting flange arranged at two ends of the cell seat along the depth direction of the cell seat, the wrapping groove is used for connecting with the connecting flange of the adjacent cell seat / outer cover, and the connecting flange is used for connecting with the wrapping groove of the adjacent cell seat / outer cover.

3. The battery case according to claim 2, characterized by The insulating sealing body includes an elastic sealing piece arranged between the wrapping groove and the connecting flange of the connecting structure, and the elastic sealing piece is used for realizing the sealing of the connection between the wrapping groove and the connecting flange by relying on the rebound force of the elastic sealing piece when the two adjacent cell seats are pressed.

4. The battery case according to any one of claims 1 to 3, characterized by At least one of the two outer covers is provided with a clamping groove, the insulating sealing body includes a sealing gasket or a sealing ring, the sealing ring is used for being clamped in the clamping groove, and the sealing gasket is used for being pressed between the outer cover and the cell seat.

5. The battery case according to any one of claims 1 to 3, wherein The cell seat is a metal cell seat, or the cell seat is a composite material cell seat including a conductive part used for connecting with the positive / negative electrode of the cell.

6. The battery case of claim 5, wherein, The composite material cell seat includes a metal part used for forming the conductive part and a non-metal part sealingly connected with the metal part, or the composite material cell seat is in an integral injection molding structure.

7. The battery case according to any one of claims 1 to 3, wherein The partition wall and other parts of the cell seat are welded / riveted / press-connected, or the partition wall and other parts of the cell seat are in an integral stretch forming structure.

8. A battery comprising a battery casing and a battery cell mounted within the battery casing, the battery cell having electrodes serving as either a positive or negative electrode, characterized in that, The battery shell is the same as the battery shell in any one of claims 1-7.

9. The battery of claim 8, wherein, The electrode of the cell is welded to the partition wall.

10. The battery according to claim 8 or 9, characterized in that, The electrode includes a tab and a transition piece connected with the tab, and the transition piece is arranged in parallel with the partition wall.

11. The battery of claim 10, wherein, First insulating material or first insulating structure is arranged between the transition piece and the first outer cover and between the transition piece and the second outer cover, and the first insulating material or first insulating structure is used for realizing the insulating isolation of the transition piece and the first outer cover and the second outer cover.

12. The battery of claim 8 or 9, wherein, Second insulating material or second insulating structure is arranged between the electrode of the cell and the battery shell, and the second insulating material or second insulating structure is used for realizing the electrical isolation of the electrode and the battery shell.

13. A battery system comprising a battery case and at least two series / parallel connected batteries installed in the battery case, characterized by, The battery is the same as the battery in any one of claims 8-12.

14. The battery system of claim 13, wherein, Insulating material or insulating and flame-retardant material is arranged between the battery shell and the battery box.

15. The battery system of claim 13 or 14, wherein, Heat insulating pieces are arranged between the two adjacent batteries.

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